Предмет: Алгебра, автор: youidiotman

3 вычислите ctga если cos a = - 4/5,180° <a<270°

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Ответы

Автор ответа: fenix6810
0

Ответ:

4/3

Объяснение:

угол в III четверти синус угла отрицательный. ctga>0

sina=√(1-cos²a)=√(1-16/25)=-3/5

ctga=cosa/sina=(-4/5)/(-3/5)=4/3

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