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Originally Posted by smmmc Thanks Just substitute for and for . After cancelling the denominators on the left side of the equation you get , which is surely true for all .
so it becomes
cos^2theta * sintheta/costheta + sin^2theta * cos theta/sin theta
= cos theta*sin theta + sin theta*cos theta
how does this equal to 1 ?
You forgot that the question is and , not and
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