sat_chen
integral from (0 to pi/2 ) tanx^2dx



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goformit100
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dw:1362005415011:dw

sat_chen
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yes thats the problem

sat_chen
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the problem shows like this dw:1361989238472:dw

sat_chen
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you cant use u substituion either

sat_chen
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i believe

SithsAndGiggles
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\[\int_0^{\frac{\pi}{2}}\tan^2x\;dx?\]
If so, use the identity
\[1+\tan^2x=\sec^2x\]

sat_chen
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i believe you can do this by trying the trig substituion from which the answer becames it diverges is that right