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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

• Follow-Ups:
  • Re: help with integration
    • From: Heike Gramberg <heike.gramberg@gmail.com>
  • Re: help with integration
    • From: Richard Hofler <rhofler@bus.ucf.edu>