Is it possible to use the reduction formula for cosine on this integral?  ∫[(1 - cos^(2)Θ) * cosΘ] dx Futhermore, is it also possible to convert the answer into terms of x by using trig identities/subtitutions (via the right triangle)? The original equation for the textbook is  ∫sqrt(x^2 - 1)/x^4 dx . I was able to use trigonometic substitution to get to ∫[(1 - cos^(2)Θ) * cosΘ] dx, but I did not get the correct answer when I tried to use the reduction formula for cosine. My textbook says the answer is (1/3)*((x^2 - 1)^(3/2))/x^3 + C . The question is from Stewart Calculus, Chapter 7 Section 3, #5.

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Is it possible to use the reduction formula for cosine on this integral?

 ∫[(1 - cos^(2)Θ) * cosΘ] dx

Futhermore, is it also possible to convert the answer into terms of x by using trig identities/subtitutions (via the right triangle)?

The original equation for the textbook is  ∫sqrt(x^2 - 1)/x^4 dx .

I was able to use trigonometic substitution to get to ∫[(1 - cos^(2)Θ) * cosΘ] dx, but I did not get the correct answer when I tried to use the reduction formula for cosine.

My textbook says the answer is (1/3)*((x^2 - 1)^(3/2))/x^3 + C .

The question is from Stewart Calculus, Chapter 7 Section 3, #5.

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