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find dy/dx ,(sqrt((1-sin2x)/(1+sin2x))) ...

find `dy/dx` ,`(sqrt((1-sin2x)/(1+sin2x)))` is equal to, `0ltxltpi/2`

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  3. find dy/dx ,(sqrt((1-sin2x)/(1+sin2x))) is equal to, 0ltxltpi/2

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