-1+sinA sin(90-A)/cot(90-A)= sin2 A
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sin (90-θ)= cos θ
cot(90-θ)= tan θ
LHS=-1+ sinA sin(90-A)/cot(90-A)
=-1 + sinA cos A / tan A
=-1 + (sinA cosA)/(sin A /cos A)
= -1 + (sinA cos A* cosA/sinA)
= -1 + cos ^2 A
= -(1- cos ^2 A)
= -sin ^2 A
cot(90-θ)= tan θ
LHS=-1+ sinA sin(90-A)/cot(90-A)
=-1 + sinA cos A / tan A
=-1 + (sinA cosA)/(sin A /cos A)
= -1 + (sinA cos A* cosA/sinA)
= -1 + cos ^2 A
= -(1- cos ^2 A)
= -sin ^2 A
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