document.write( "Question 950264: Rewrite as a product Cos9x-Cox7x\r
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Algebra.Com's Answer #580212 by jhaashok630(18)\"\" \"About 
You can put this solution on YOUR website!
yes right \r
\n" ); document.write( "\n" ); document.write( "Formula : Cos A - Cos B = -2 sin (A+B)/2 sin(A-B)/2
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