integrate tan^2(3x)sec^4(3x)dx

integrate (1+sinx)/(cos^2 x) dx

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- Nov 20th 2008, 12:50 PMholly123two calculus trig integral problems!
integrate tan^2(3x)sec^4(3x)dx

integrate (1+sinx)/(cos^2 x) dx - Nov 20th 2008, 01:04 PMgalactus

Let

Rewrite by using the identity

Now, a simple sub and it works out well to finish.

Let

Then, resub.