Posted by **Arisa** on Friday, June 19, 2009 at 8:33am.

Use the derivatives of sinx and cosx to show that d/dx [tanx] = sec^2 and that d/dx [secx]=sec^2xsinx.

Hence evaluate ∫ [1 + sinx]/[cos^2x] dx limit from 0 to pi

I know the first part of the question, i'm not sure how i should do the second part "hence ..."

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