Величина tg(arccos(-0,6)) равна?

Question

Величина tg(arccos(-0,6)) равна?

Answer 1

-1 1/3 =====================================

Comments

пусть arcc0s( -0.6)=a
cosa=-0.6

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sina=корень(1-0,6^2)=0.8

tga=0.8/0.6=1 1/3

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ошибка - надо минус где cosa -0.8/0.6=-1 1/3