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Find derivatives of the following functi...

Find derivatives of the following functions.`sin((1-x^2)/(1 + x^2)).`

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`y = sin((1 - x^2)/(1 + x^2)
dy/dx = cos((1 - x^2)/(1 + x^2)). d/dx((1 - x^2)/(1 + x^2))
= cos((1 - x^2)/(1 +x^2)).(-2x(1+x^2)-(1-x^2).2x)/{(1 + x^2)^2
cos((1-x^2)/(1 + x^2)). {-2x(1+x^2)-(1-x^2).2x}/{(1+x^2)^2}`
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