Originally Posted by

**amaya** I am stuck on a couple questions on my homework due tomorrow...if anyone can help me that would be great! I've been working on them for way too long. Thanks!

#6: evaluate: integral sec(x)/4tan^2(x)

I have narrowed it down to: 1/4integral 1/tan^3(x) ...but I'm not sure if that is right.

#4: if we use the substitution x=2sin(theta), then which of the following integrals is equivalent to: integral (x^2)/sqrt(4-x^2) dx ?

a) integral 4sin^2(theta)

b) integral sin^2(theta)/cos^2(theta)

c) integral 4*[sin^2(theta)]*cos(theta)