document.write( "Question 782173: verify that (sin x + cos x)^2 + (sin x - cos x)^2 = 1 \n" ); document.write( "
Algebra.Com's Answer #476315 by Alan3354(69443)\"\" \"About 
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verify that (sin x + cos x)^2 + (sin x - cos x)^2 = 1
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\n" ); document.write( "sin^2 + 2sincos + cos^2 + sin^2 - 2sincos + cos^2 =? 1
\n" ); document.write( "2sin^2 + 2cos^2 =? 1
\n" ); document.write( "It doesn't.
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