Posted by coried on Friday, July 24, 2009 at 11:34pm.
common factor of (49-x^2)^(-1/2) at the top
= (49-x^2)^(-1/2)[49-x^2 + 3x^2]/(49-x^2)
= (49 + 2x^2)/(49 - x^2)^(3/2)
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