Question

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And solve in book

Answer 1

sin (90- A)= cos A

cot (90-A)= tan A

LHS = -1 + sin A sin(90-A)/cot(90-A)

= -1+ sinAcos A/tanA

= -1 + sinA cosA * cosA/sinA

= -1 + cos^2A

= -(1- cos^2 A)

= - sin^2 A

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Answer 2

I. hope it will help you