1.

Prove that :cot^2 x . (sec x - 1)/(1 + sin x) + sec^2 x . (sin x -1)/(1 + sec x) = 0

Answer» Prove that :
cot^2 x . (sec x - 1)/(1 + sin x) + sec^2 x . (sin x -1)/(1 + sec x) = 0


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