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anonymous

  • 4 years ago

Calculus II - Trig Integration Hello, I am stuck on getting the following problem setup; Evaluate the integral; \[\int\limits(1/(x*\sqrt(x^8-9) dx\] So I know this is in the form \[\int\limits du/u*\sqrt(u^2 - a^2) = (1/a) \sec^-1(|u/a|) + C\] But I am not sure how to get that X and X^8 out of there. I know if the X was X^4 then X^8 would be (X^4)^2 but I am not really sure what to do. Any help starting this problem out would be great!

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  1. anonymous
    • 4 years ago
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    Is it as simple as saying U = X^4 and then solving for U?

  2. amistre64
    • 4 years ago
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    looks to be a secant type?

  3. amistre64
    • 4 years ago
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    yeah, if i recall correctly

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