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If y=tan^(-1)(frac[1+sinx][1-sinx])^(fra...

If `y=tan^(-1)(frac[1+sinx][1-sinx])^(frac[1][2])` and `z=log(frac[1+cosx][1-cosx])`, then prove that `frac[dy][dx]=frac[-sinx][4]`

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