Integration Homework Help: Solving Integral [sec(x^2)/81 + tan(x^2)]

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SUMMARY

The integral of the expression [sec(x^2)/81 + tan(x^2)] requires careful manipulation of trigonometric identities and integration techniques. The attempt at a solution incorrectly simplifies the integral to 1/8 sin(x^2), which does not match the expected multiple-choice answers. To correctly solve this integral, one must apply the appropriate integration methods and possibly test each multiple-choice option against the original integral to identify the correct answer.

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Homework Statement


Integral [sec(x^2)/ 81 + tan (x^2)]


Homework Equations



sinx^2 + cos x^2=1
sec= 1/cos

The Attempt at a Solution



integral[ 1/81cos (x^2) + 81(sin(x^2)/cos(x^2))]
= 1/81 integral [1/ 1/cos(x^2)]= 1/8 integral[cos(x^2)]
= 1/8 sin(x^2)
This was my answer. But this is not right according to multiple choice quiz. Please let me know how to do this problem.

thanks.
 
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Something makes me think finding the anti derivative won't be easy. But since this is a Multiple choice question, can you see how we can test each of those answers?
 

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