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Differentiate (1-tanx)/(1+tanx)...

Differentiate `(1-tanx)/(1+tanx)`

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`(1-tanx)/(1+tanx)`
`d/dx(1-tanx)(1+tanx)`
`((-1+tanx)xxd/dx(1+tanx))/((1+tanx)^2)`
`(-sec^2x(1+tanx)-(1-tanx)sec^2x)/((1+tanx)^2)`
`=(-2sec^2x)/((1+tanx)^2)`
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