# Integral problem

1. Jun 26, 2005

I've almost gotten through this one integral problem, but i've seem to have gotten stuck:

integral ((sqrt(4-x^2))/x) dx
i let x = 2sin(theta), and dx = 2cos(theta)d(theta)
sqrt(4-x^2) = 2cos(theta)
integral ((2cos(theta))/(2sin(theta)) * 2cosd(theta)
2 integral cos^2(theta)d(theta)/sin(theta)

That's as far as I got, any suggestions?

2. Jun 26, 2005

### whozum

Sure, express [itex] cos^2(\theta) [/tex] in terms of the sin function, sort of like yo udid earlier. You're on the right track.