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inttan^3theta d theta...

`inttan^3theta d theta`

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`inttan^3theta d theta=inttantheta.(tan^2theta) d theta`
=`inttantheta.(sec^2theta-1) d theta`
=`inttantheta.sec^2theta d theta- inttantheta d theta`
=`inttantheta d (tantheta)- inttantheta d theta`
=`1/2tan^2theta+In abscostheta +C`
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