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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.