document.write( "Question 1005320: Verify the identify\r
\n" ); document.write( "\n" ); document.write( "cos^2x-sin^2x=2cos^2x-1\r
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Algebra.Com's Answer #621621 by ikleyn(52834)\"\" \"About 
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\n" ); document.write( "Verify the identify
\n" ); document.write( "cos^2x - sin^2x = 2cos^2x - 1
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\n" ); document.write( "\n" ); document.write( "Add \"2sin%5E2%28x%29\" to both sides.\r
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