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Need help in Integration

  • Thread starter zingoria
  • Start date
  • #1
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1. Homework Statement
Integral [sec(x^2)/ 81 + tan (x^2)]


2. Homework Equations

sinx^2 + cos x^2=1
sec= 1/cos
3. 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.
 

Answers and Replies

  • #2
Gib Z
Homework Helper
3,344
4
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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