Предмет: Геометрия, автор: RomaGusarov90

Синус равен 1/9. Найдите косинус и тангенс

Ответы

Автор ответа: Permarganat

3

cos"a + sin" a = 1,
cos" a = 1 - sin"a, cos a = корень из ( 1 - sin"a)

cos a= корень из (1-(1/9)")= корень из(1-1/81)=корень из 80/81

тангенс это отношение синуса к косинусу
tg = sin/cos

tg =1/9:80/81= 1/9*81/80=9/80

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