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intxsecx^2\ dx is equal to 1/2log(secx^2...

`intxsecx^2\ dx` is equal to `1/2log(secx^2+tanx^2)+C` (b) `(x^2)/2log(secx^2+tanx^2)+C` (c) `2log(secx^2+tanx^2)+C` (d) none of these

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Given,I=`intxsecx^2\ dx`
Let `x^2=t`
`2xdx=dt`
So,I=`1/2intxsectdt`
=`1/2log(sect+tant)+C` =`1/2log(secx^2+tanx^2)+C`
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