Evaluate displaystyle int tan^{-1} { sqrt { frac { 1- cos 2x}{1+ cos 2x} } }dx
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1-cos^2x
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=1-2\sin(x)&line2=\mathrm{Solution\:is\:}x=2%CF%80n,x=%CF%80%2B2%CF%80n,x=\frac{%CF%80}{2}%2B2%CF%80n "cos(2x)=1-2sin(x)")
cos(2x)=1-2sin(x)
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