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If x in(0,(pi)/(2))cup((pi)/(2),pi) and...

If x `in(0,(pi)/(2))cup((pi)/(2),pi)` and `y = sqrt((1-cos 2x)/(1+cos2x))` , then find `(dy)/(dx)` .

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The correct Answer is:
`(dy)/(dx)={(sec^(2)x," ""when "x in(0,(pi)/(2))),(-sec^(2)x," "when "x in ((pi)/(2),pi)):}`
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