1.

- ,:. hat1-cos9— (cosec 0 —cot 0)°1 + 00590

Answer»

(1-cos x)/(1+cos x)=(cosec x-cot x)^2

L.H.S.

=(1-cos x)×(1-cos x)/(1+cos x)×(1-cos x)

=(1-cos x)^2/(1-cos^2x)

=(1-cos x)^2/(sin x)^2

=[(1-cos x)/sin x]^2

=[1/sin x - cos x/sin x]^2

=(cosec x- cot x)^2

Hence Proved.


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