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Homework Help: Integral problem

  1. Jun 26, 2005 #1
    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. jcsd
  3. Jun 26, 2005 #2
    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.
     
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