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help with integration
*To*: mathgroup at smc.vnet.net
*Subject*: [mg121632] help with integration
*From*: Salman Durrani <dsalman96 at yahoo.com>
*Date*: Fri, 23 Sep 2011 03:43:15 -0400 (EDT)
*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com
I am trying to do the following integration:
Integrate[r^2*ArcCos[x/r] - x*Sqrt[r^2 - x^2], {x, Sqrt[3] y, Sqrt[r^2 - y^2]} ]
When I try, Mathematica comes back to be with a very long conditional expression.
How do I tell mathematica that r is positive, real in the above equation not complex.
Thanks
Kahless
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