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Evaluate: inttan^3xsec^2xdx...

Evaluate: `inttan^3xsec^2xdx`

Text Solution

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I=`inttan^3xsec^2xdx`
Let `tanx=t`
`sec^2xdx=dt`
I=`int t^3dt`
=`t^4/4+c`
=`(tanx)^4/4+c`
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