Question

Is square root 1-cos^2theta=-sintheta true? if so, in which quadrants does angle theta terminate?

Answer 1

Yes it is true:

(1 - cos^2 x) = sin^2 x Sqr.(1 - cos^2 x) = sin x and (-sinx) True, since sin x negative. Also, x terminates in quadrant 3 and 4. Hope this is helpful