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Evaluate: inttan^(-1){sqrt(((1-cosx)/(1+...

Evaluate: `inttan^(-1){sqrt(((1-cosx)/(1+cosx)))}`

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`int tan^(-1){sqrt(((1-cos2x)/(1+cos2x)))}dx`
`=int tan^(-1){sqrt((2 sin^(2)x)/(2cos^(2)x))}dx`
`=int tan^(-1)(tan x)dx=int xdx=(x^(2))/(2)+C`
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