Prove the following: cos(90°−A) sin(90°−A) /tan(90°−A) -sin^2 A

Prove the following: cos(90°−A) sin(90°−A) /tan(90°−A) -sin2 A = 0

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sin(90^@-60^@)=?, 10, बोर्ड स्पेशल, MATHS