Prove that - -1- sinA sin 90 -A cot 90 -A - sin 2 A-

L.H.S = 1+sinAsin(90 A)(90 A) = 1+sinAcosAtanA = 1+sinAcosAsinAcosA = 1+cos^2A = (1 cos^2A) = sin^2A ...

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Sin(A+B)Sin(A-B)

Prove that : ...

Question

Prove that :
$- 1 + \frac{s i n A s i n (90^{\circ} - A)}{c o t (90 - A)} = - {s i n}^{2} A .$

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