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Math Help - integration help on question

  1. #1
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    integration help on question

    integrate
    <br /> <br />
\int (7sec(9-8x)tan(9-8x)) dx<br /> <br />

    any help much appreciated
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  2. #2
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    Quote Originally Posted by jvignacio View Post
    integrate
    <br /> <br />
\int (7sec(9-8x)tan(9-8x)) dx<br /> <br />

    any help much appreciated
    First make the substitution u = 9 - 8x. Then note that sec(u) tan(u) = sin(u)/cos^2(u). So make the substitution w = cos(u).

    Try this. Show your working and where you get stuck if you still have trouble.
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