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 August 13th, 2012, 01:54 AM #1 Member   Joined: Jan 2012 Posts: 82 Thanks: 0 simplification Hi! I need to simplify the following r^2 - r cos theta ( r sin theta cos phi) can anyone help? Arron
 August 13th, 2012, 02:18 AM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs Re: simplification The best I can see is to write: $r^2-r\cos\theta$$r\sin\theta\cos\varphi$$=r^2$$1-\cos\theta\sin\theta\cos\varphi$$=r^2$$1-\frac{1}{2}\sin2\theta\cos\varphi$$$
 August 14th, 2012, 03:46 AM #3 Member   Joined: Jan 2012 Posts: 82 Thanks: 0 Re: simplification Thanks, but I not sure if gave the equation right. How about r^2 - r cos theta r sin theta cos phi arron
 August 14th, 2012, 04:50 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,916 Thanks: 2199 That's an expression, not an equation, and is equivalent to the expression you gave originally.

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