Предмет: Алгебра, автор: nklop


Помогите пожалуйста !
найдите cos a если sin a=-0,6 и 270<а<360

Ответы

Автор ответа: mukus13
2
cos^2x=1-sin^2x
cosx= ± \sqrt{1-sin^2x} = ± \sqrt{1-0.36} = ± \sqrt{0.64} =± 0.8
 так как в 4 четверти cos положителен, то 
сos x = 0.8
mukus13: букву А не писать, редактор формул глючит
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