Posted by **mike** on Monday, April 6, 2009 at 3:46pm.

how would you prove that sin^2(a)-cos^2(b)= sin^2(b)-cos^2(a).

i'm not completely sure that this is right but i used the difference of two squares on it to get (sin(a)+cos(b))(sin(a)-cos(b)) then after that i am stuck. please help

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