I am tutoring a student in Calculus 2 and cannot seem to get the following 2 problems (it's been a while since I took this course) 1. Find the indefinite integral of dx/(x(x^2+4)^2) 2. Find dy/dx of y=ln(x^2+y^2)
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Originally Posted by rainbowkaine 2. Find dy/dx of y=ln(x^2+y^2) Use implicit differentiation. From here, expand the right hand side and then collect all terms containing y' onto one side of the equation, factor out y' and solve algebraically.
Originally Posted by rainbowkaine 1. Find the indefinite integral of dx/(x(x^2+4)^2) hard way: do a trig substitution of an easier way: note that we have this integral (by multiplying by x/x): now, let then So our integral becomes: which is relatively easy to do via partial fractions
Last edited by mr fantastic; Apr 10th 2009 at 12:20 AM. Reason: Fixed an obvious typo (red)
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