Калькулятор косинусов

Косинус для некоторых углов можно найти точные значения, а для других сложно определить точную цифру и можно вывести только приблизительное значение. 

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Первоначальные данные

X=
A=

Таблица косинусов от 0 до 90 градусов

0° до 15°16° до 31°32° до 45°
cos(0°) = 1cos(16°) = 0.961262cos(32°) = 0.848048
cos(1°) = 0.999848cos(17°) = 0.956305cos(33°) = 0.838671
cos(2°) = 0.999391cos(18°) = 0.951057cos(34°) = 0.829038
cos(3°) = 0.99863cos(19°) = 0.945519cos(35°) = 0.819152
cos(4°) = 0.997564cos(20°) = 0.939693cos(36°) = 0.809017
cos(5°) = 0.996195cos(21°) = 0.93358cos(37°) = 0.798636
cos(6°) = 0.994522cos(22°) = 0.927184cos(38°) = 0.788011
cos(7°) = 0.992546cos(23°) = 0.920505cos(39°) = 0.777146
cos(8°) = 0.990268cos(24°) = 0.913545cos(40°) = 0.766044
cos(9°) = 0.987688cos(25°) = 0.906308cos(41°) = 0.75471
cos(10°) = 0.984808cos(26°) = 0.898794cos(42°) = 0.743145
cos(11°) = 0.981627cos(27°) = 0.891007cos(43°) = 0.731354
cos(12°) = 0.978148cos(28°) = 0.882948cos(44°) = 0.71934
cos(13°) = 0.97437cos(29°) = 0.87462cos(45°) = 0.707107
cos(14°) = 0.970296cos(30°) = 0.866025 
cos(15°) = 0.965926cos(31°) = 0.857167 
46° до 60°61° до 75°76° до 90°
cos(46°) = 0.694658cos(61°) = 0.48481cos(76°) = 0.241922
cos(47°) = 0.681998cos(62°) = 0.469472cos(77°) = 0.224951
cos(48°) = 0.669131cos(63°) = 0.45399cos(78°) = 0.207912
cos(49°) = 0.656059cos(64°) = 0.438371cos(79°) = 0.190809
cos(50°) = 0.642788cos(65°) = 0.422618cos(80°) = 0.173648
cos(51°) = 0.62932cos(66°) = 0.406737cos(81°) = 0.156434
cos(52°) = 0.615661cos(67°) = 0.390731cos(82°) = 0.139173
cos(53°) = 0.601815cos(68°) = 0.374607cos(83°) = 0.121869
cos(54°) = 0.587785cos(69°) = 0.358368cos(84°) = 0.104528
cos(55°) = 0.573576cos(70°) = 0.34202cos(85°) = 0.087156
cos(56°) = 0.559193cos(71°) = 0.325568cos(86°) = 0.069756
cos(57°) = 0.544639cos(72°) = 0.309017cos(87°) = 0.052336
cos(58°) = 0.529919cos(73°) = 0.292372cos(88°) = 0.034899
cos(59°) = 0.515038cos(74°) = 0.275637cos(89°) = 0.017452
cos(60°) = 0.5cos(75°) = 0.258819cos(90°) = 0

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