Trying to do the indefinate integral of x^3 * (9-x^2)^1/2 by using the substitution of x = 3 sin u I get 81* integral[ (sin^3 u)(cos u)] but again I appear to be wrong.
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I think you forgot to make the sub for dx. This last integral should be straightforward. Make the substitution s = sin u and you should be on your way
Thanks for that you are right I had forgot to sub in the dx value. How do you guys use the correct mathmatic symbols in the post?
Originally Posted by Craka How do you guys use the correct mathmatic symbols in the post? See the sticky in the LaTex help forum.
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