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

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

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`y=(1-cosx)/(1+cosx)`
`d/dx(1-cosx)(1+cosx)`
`dy/dx=(-(1-cosx)d/dx(1+cosx))/(1+cosx)^2`
`=(sinx(1+cosx)+(1-cosx)sinx)/(1+cosx)^2`
`(2sinx)/(1+cosx)^2`
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