Решение тригонометрических примеров
1. Примеры с градусной мерой.
Пример 1.
Найдем sin 750º, cos (-1920º).
Решение.
1) sin 750º = sin (2 · 360º + 30º) = sin 30º = sin π/6 = 1/2
Пояснение:
sin 750º означает, что мы совершили два полных оборота по окружности, затем остановились в точке 30º. То есть 30º и 750º — идентичные величины. А sin 30º равен 1/2.
2) cos (-1920º) = cos 1920º = cos (5 · 360º + 120º) = cos 120º = cos 2π/3 = -1/2.
Пояснение: согласно свойству косинуса, cos (-α) = cos α. Дальнейшие действия объяснены в предыдущем примере.
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Незнайка → ЕГЭ → Математика → Базовая → Вариант 12 → Задание 5
Задание № 4441
Найдите sin 750°.
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Комментарий:
Синус — функция периодическая [math]T=360^o=2pi[/math]
[math]sin(750^circ)=sin(30^circ+720^circ)=sin(30^circ)=0,5[/math]
Ответ: 0,5
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Используя формулу приведения вычислить sin 750 градусов cos 750 градусов sin47 6 π cos47 6 π.
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The value of sin 750 degrees is 0.5. Sin 750 degrees in radians is written as sin (750° × π/180°), i.e., sin (25π/6) or sin (13.089969. . .). In this article, we will discuss the methods to find the value of sin 750 degrees with examples.
- Sin 750°: 0.5
- Sin 750° in fraction: 1/2
- Sin (-750 degrees): -0.5
- Sin 750° in radians: sin (25π/6) or sin (13.0899693 . . .)
What is the Value of Sin 750 Degrees?
The value of sin 750 degrees in decimal is 0.5. Sin 750 degrees can also be expressed using the equivalent of the given angle (750 degrees) in radians (13.08996 . . .).
We know, using degree to radian conversion, θ in radians = θ in degrees × (pi/180°)
⇒ 750 degrees = 750° × (π/180°) rad = 25π/6 or 13.0899 . . .
∴ sin 750° = sin(13.0899) = 1/2 or 0.5
Explanation:
For sin 750°, the angle 750° > 360°. Given the periodic property of the sine function, we can represent it as sin(750° mod 360°) = sin(30°). The angle 750°, coterminal to angle 30°, is located in the First Quadrant(Quadrant I).
Since sine function is positive in the 1st quadrant, thus sin 750 degrees value = 1/2 or 0.5
Similarly, sin 750° can also be written as, sin 750 degrees = (750° + n × 360°), n ∈ Z.
⇒ sin 750° = sin 1110° = sin 1470°, and so on.
Note: Since, sine is an odd function, the value of sin(-750°) = -sin(750°).
Methods to Find Value of Sin 750 Degrees
The sine function is positive in the 1st quadrant. The value of sin 750° is given as 0.5. We can find the value of sin 750 degrees by:
- Using Unit Circle
- Using Trigonometric Functions
Sin 750 Degrees Using Unit Circle
To find the value of sin 750 degrees using the unit circle, represent 750° in the form (2 × 360°) + 30° [∵ 750°>360°] ∵ sine is a periodic function, sin 750° = sin 30°.
- Rotate ‘r’ anticlockwise to form a 30° or 750° angle with the positive x-axis.
- The sin of 750 degrees equals the y-coordinate(0.5) of the point of intersection (0.866, 0.5) of unit circle and r.
Hence the value of sin 750° = y = 0.5
Sin 750° in Terms of Trigonometric Functions
Using trigonometry formulas, we can represent the sin 750 degrees as:
- ± √(1-cos²(750°))
- ± tan 750°/√(1 + tan²(750°))
- ± 1/√(1 + cot²(750°))
- ± √(sec²(750°) — 1)/sec 750°
- 1/cosec 750°
Note: Since 750° lies in the 1st Quadrant, the final value of sin 750° will be positive.
We can use trigonometric identities to represent sin 750° as,
- sin(180° — 750°) = sin(-570°)
- -sin(180° + 750°) = -sin 930°
- cos(90° — 750°) = cos(-660°)
- -cos(90° + 750°) = -cos 840°
☛ Also Check:
- sin 120 degrees
- sin 60 degrees
- sin 10 degrees
- sin 765 degrees
- sin 585 degrees
- sin 88 degrees
FAQs on Sin 750 Degrees
What is Sin 750 Degrees?
Sin 750 degrees is the value of sine trigonometric function for an angle equal to 750 degrees. The value of sin 750° is 1/2 or 0.5.
How to Find the Value of Sin 750 Degrees?
The value of sin 750 degrees can be calculated by constructing an angle of 750° with the x-axis, and then finding the coordinates of the corresponding point (0.866, 0.5) on the unit circle. The value of sin 750° is equal to the y-coordinate (0.5). ∴ sin 750° = 0.5.
How to Find Sin 750° in Terms of Other Trigonometric Functions?
Using trigonometry formula, the value of sin 750° can be given in terms of other trigonometric functions as:
- ± √(1-cos²(750°))
- ± tan 750°/√(1 + tan²(750°))
- ± 1/√(1 + cot²(750°))
- ± √(sec²(750°) — 1)/sec 750°
- 1/cosec 750°
☛ Also check: trigonometric table
What is the Value of Sin 750° in Terms of Sec 750°?
Since the sine function can be represented using the secant function, we can write sin 750° as √(sec²(750°) — 1)/sec 750°. The value of sec 750° is equal to 1.154701.
What is the Value of Sin 750 Degrees in Terms of Tan 750°?
We know, using trig identities, we can write sin 750° as tan 750°/√(1 + tan²(750°)). Here, the value of tan 750° is equal to 0.577350.
Таблица синусов.
Таблица синусов — это записанные в таблицу посчитанные значения синусов углов от 0° до 360°. Используя таблицу синусов вы сможете провести расчеты даже если под руками не окажется инженерного калькулятора. Чтобы узнать значение синуса от нужного Вам угла достаточно найти его в таблице.
Калькулятор — синус угла
sin(°) = 0
Калькулятор — арксинус угла
arcsin() = 90°
Таблица синусов в радианах
| α | 0 | π6 | π4 | π3 | π2 | π | 3π2 | 2π |
| sin α | 0 | 12 | √22 | √32 | 1 | 0 | -1 | 0 |
Таблица синусов углов от 0° до 180°
| sin(0°) = 0 sin(1°) = 0.017452 sin(2°) = 0.034899 sin(3°) = 0.052336 sin(4°) = 0.069756 sin(5°) = 0.087156 sin(6°) = 0.104528 sin(7°) = 0.121869 sin(8°) = 0.139173 sin(9°) = 0.156434 sin(10°) = 0.173648 sin(11°) = 0.190809 sin(12°) = 0.207912 sin(13°) = 0.224951 sin(14°) = 0.241922 sin(15°) = 0.258819 sin(16°) = 0.275637 sin(17°) = 0.292372 sin(18°) = 0.309017 sin(19°) = 0.325568 sin(20°) = 0.34202 sin(21°) = 0.358368 sin(22°) = 0.374607 sin(23°) = 0.390731 sin(24°) = 0.406737 sin(25°) = 0.422618 sin(26°) = 0.438371 sin(27°) = 0.45399 sin(28°) = 0.469472 sin(29°) = 0.48481 sin(30°) = 0.5 sin(31°) = 0.515038 sin(32°) = 0.529919 sin(33°) = 0.544639 sin(34°) = 0.559193 sin(35°) = 0.573576 sin(36°) = 0.587785 sin(37°) = 0.601815 sin(38°) = 0.615661 sin(39°) = 0.62932 sin(40°) = 0.642788 sin(41°) = 0.656059 sin(42°) = 0.669131 sin(43°) = 0.681998 sin(44°) = 0.694658 sin(45°) = 0.707107 |
sin(46°) = 0.71934 sin(47°) = 0.731354 sin(48°) = 0.743145 sin(49°) = 0.75471 sin(50°) = 0.766044 sin(51°) = 0.777146 sin(52°) = 0.788011 sin(53°) = 0.798636 sin(54°) = 0.809017 sin(55°) = 0.819152 sin(56°) = 0.829038 sin(57°) = 0.838671 sin(58°) = 0.848048 sin(59°) = 0.857167 sin(60°) = 0.866025 sin(61°) = 0.87462 sin(62°) = 0.882948 sin(63°) = 0.891007 sin(64°) = 0.898794 sin(65°) = 0.906308 sin(66°) = 0.913545 sin(67°) = 0.920505 sin(68°) = 0.927184 sin(69°) = 0.93358 sin(70°) = 0.939693 sin(71°) = 0.945519 sin(72°) = 0.951057 sin(73°) = 0.956305 sin(74°) = 0.961262 sin(75°) = 0.965926 sin(76°) = 0.970296 sin(77°) = 0.97437 sin(78°) = 0.978148 sin(79°) = 0.981627 sin(80°) = 0.984808 sin(81°) = 0.987688 sin(82°) = 0.990268 sin(83°) = 0.992546 sin(84°) = 0.994522 sin(85°) = 0.996195 sin(86°) = 0.997564 sin(87°) = 0.99863 sin(88°) = 0.999391 sin(89°) = 0.999848 sin(90°) = 1 |
sin(91°) = 0.999848 sin(92°) = 0.999391 sin(93°) = 0.99863 sin(94°) = 0.997564 sin(95°) = 0.996195 sin(96°) = 0.994522 sin(97°) = 0.992546 sin(98°) = 0.990268 sin(99°) = 0.987688 sin(100°) = 0.984808 sin(101°) = 0.981627 sin(102°) = 0.978148 sin(103°) = 0.97437 sin(104°) = 0.970296 sin(105°) = 0.965926 sin(106°) = 0.961262 sin(107°) = 0.956305 sin(108°) = 0.951057 sin(109°) = 0.945519 sin(110°) = 0.939693 sin(111°) = 0.93358 sin(112°) = 0.927184 sin(113°) = 0.920505 sin(114°) = 0.913545 sin(115°) = 0.906308 sin(116°) = 0.898794 sin(117°) = 0.891007 sin(118°) = 0.882948 sin(119°) = 0.87462 sin(120°) = 0.866025 sin(121°) = 0.857167 sin(122°) = 0.848048 sin(123°) = 0.838671 sin(124°) = 0.829038 sin(125°) = 0.819152 sin(126°) = 0.809017 sin(127°) = 0.798636 sin(128°) = 0.788011 sin(129°) = 0.777146 sin(130°) = 0.766044 sin(131°) = 0.75471 sin(132°) = 0.743145 sin(133°) = 0.731354 sin(134°) = 0.71934 sin(135°) = 0.707107 |
sin(136°) = 0.694658 sin(137°) = 0.681998 sin(138°) = 0.669131 sin(139°) = 0.656059 sin(140°) = 0.642788 sin(141°) = 0.62932 sin(142°) = 0.615661 sin(143°) = 0.601815 sin(144°) = 0.587785 sin(145°) = 0.573576 sin(146°) = 0.559193 sin(147°) = 0.544639 sin(148°) = 0.529919 sin(149°) = 0.515038 sin(150°) = 0.5 sin(151°) = 0.48481 sin(152°) = 0.469472 sin(153°) = 0.45399 sin(154°) = 0.438371 sin(155°) = 0.422618 sin(156°) = 0.406737 sin(157°) = 0.390731 sin(158°) = 0.374607 sin(159°) = 0.358368 sin(160°) = 0.34202 sin(161°) = 0.325568 sin(162°) = 0.309017 sin(163°) = 0.292372 sin(164°) = 0.275637 sin(165°) = 0.258819 sin(166°) = 0.241922 sin(167°) = 0.224951 sin(168°) = 0.207912 sin(169°) = 0.190809 sin(170°) = 0.173648 sin(171°) = 0.156434 sin(172°) = 0.139173 sin(173°) = 0.121869 sin(174°) = 0.104528 sin(175°) = 0.087156 sin(176°) = 0.069756 sin(177°) = 0.052336 sin(178°) = 0.034899 sin(179°) = 0.017452 sin(180°) = 0 |
Таблица синусов углов от 181° до 360°
| sin(181°) = -0.017452 sin(182°) = -0.034899 sin(183°) = -0.052336 sin(184°) = -0.069756 sin(185°) = -0.087156 sin(186°) = -0.104528 sin(187°) = -0.121869 sin(188°) = -0.139173 sin(189°) = -0.156434 sin(190°) = -0.173648 sin(191°) = -0.190809 sin(192°) = -0.207912 sin(193°) = -0.224951 sin(194°) = -0.241922 sin(195°) = -0.258819 sin(196°) = -0.275637 sin(197°) = -0.292372 sin(198°) = -0.309017 sin(199°) = -0.325568 sin(200°) = -0.34202 sin(201°) = -0.358368 sin(202°) = -0.374607 sin(203°) = -0.390731 sin(204°) = -0.406737 sin(205°) = -0.422618 sin(206°) = -0.438371 sin(207°) = -0.45399 sin(208°) = -0.469472 sin(209°) = -0.48481 sin(210°) = -0.5 sin(211°) = -0.515038 sin(212°) = -0.529919 sin(213°) = -0.544639 sin(214°) = -0.559193 sin(215°) = -0.573576 sin(216°) = -0.587785 sin(217°) = -0.601815 sin(218°) = -0.615661 sin(219°) = -0.62932 sin(220°) = -0.642788 sin(221°) = -0.656059 sin(222°) = -0.669131 sin(223°) = -0.681998 sin(224°) = -0.694658 sin(225°) = -0.707107 |
sin(226°) = -0.71934 sin(227°) = -0.731354 sin(228°) = -0.743145 sin(229°) = -0.75471 sin(230°) = -0.766044 sin(231°) = -0.777146 sin(232°) = -0.788011 sin(233°) = -0.798636 sin(234°) = -0.809017 sin(235°) = -0.819152 sin(236°) = -0.829038 sin(237°) = -0.838671 sin(238°) = -0.848048 sin(239°) = -0.857167 sin(240°) = -0.866025 sin(241°) = -0.87462 sin(242°) = -0.882948 sin(243°) = -0.891007 sin(244°) = -0.898794 sin(245°) = -0.906308 sin(246°) = -0.913545 sin(247°) = -0.920505 sin(248°) = -0.927184 sin(249°) = -0.93358 sin(250°) = -0.939693 sin(251°) = -0.945519 sin(252°) = -0.951057 sin(253°) = -0.956305 sin(254°) = -0.961262 sin(255°) = -0.965926 sin(256°) = -0.970296 sin(257°) = -0.97437 sin(258°) = -0.978148 sin(259°) = -0.981627 sin(260°) = -0.984808 sin(261°) = -0.987688 sin(262°) = -0.990268 sin(263°) = -0.992546 sin(264°) = -0.994522 sin(265°) = -0.996195 sin(266°) = -0.997564 sin(267°) = -0.99863 sin(268°) = -0.999391 sin(269°) = -0.999848 sin(270°) = -1 |
sin(271°) = -0.999848 sin(272°) = -0.999391 sin(273°) = -0.99863 sin(274°) = -0.997564 sin(275°) = -0.996195 sin(276°) = -0.994522 sin(277°) = -0.992546 sin(278°) = -0.990268 sin(279°) = -0.987688 sin(280°) = -0.984808 sin(281°) = -0.981627 sin(282°) = -0.978148 sin(283°) = -0.97437 sin(284°) = -0.970296 sin(285°) = -0.965926 sin(286°) = -0.961262 sin(287°) = -0.956305 sin(288°) = -0.951057 sin(289°) = -0.945519 sin(290°) = -0.939693 sin(291°) = -0.93358 sin(292°) = -0.927184 sin(293°) = -0.920505 sin(294°) = -0.913545 sin(295°) = -0.906308 sin(296°) = -0.898794 sin(297°) = -0.891007 sin(298°) = -0.882948 sin(299°) = -0.87462 sin(300°) = -0.866025 sin(301°) = -0.857167 sin(302°) = -0.848048 sin(303°) = -0.838671 sin(304°) = -0.829038 sin(305°) = -0.819152 sin(306°) = -0.809017 sin(307°) = -0.798636 sin(308°) = -0.788011 sin(309°) = -0.777146 sin(310°) = -0.766044 sin(311°) = -0.75471 sin(312°) = -0.743145 sin(313°) = -0.731354 sin(314°) = -0.71934 sin(315°) = -0.707107 |
sin(316°) = -0.694658 sin(317°) = -0.681998 sin(318°) = -0.669131 sin(319°) = -0.656059 sin(320°) = -0.642788 sin(321°) = -0.62932 sin(322°) = -0.615661 sin(323°) = -0.601815 sin(324°) = -0.587785 sin(325°) = -0.573576 sin(326°) = -0.559193 sin(327°) = -0.544639 sin(328°) = -0.529919 sin(329°) = -0.515038 sin(330°) = -0.5 sin(331°) = -0.48481 sin(332°) = -0.469472 sin(333°) = -0.45399 sin(334°) = -0.438371 sin(335°) = -0.422618 sin(336°) = -0.406737 sin(337°) = -0.390731 sin(338°) = -0.374607 sin(339°) = -0.358368 sin(340°) = -0.34202 sin(341°) = -0.325568 sin(342°) = -0.309017 sin(343°) = -0.292372 sin(344°) = -0.275637 sin(345°) = -0.258819 sin(346°) = -0.241922 sin(347°) = -0.224951 sin(348°) = -0.207912 sin(349°) = -0.190809 sin(350°) = -0.173648 sin(351°) = -0.156434 sin(352°) = -0.139173 sin(353°) = -0.121869 sin(354°) = -0.104528 sin(355°) = -0.087156 sin(356°) = -0.069756 sin(357°) = -0.052336 sin(358°) = -0.034899 sin(359°) = -0.017452 sin(360°) = 0 |