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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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`y=sqrt((1-sin 2x)/(1+ sin 2x))=(cos x - sin x)/(cos x + sin x)=(1-tan x)/(1+ tan x)=tan ((pi)/(4)-x)`
`therefore (dy)/(dx)=-sec^(2)((pi)/(4)-x)`
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