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Algebra.Com's Answer #176434 by Edwin McCravy(20062) $\"\"$ $\"About$

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$\"%28Sin%5E2x%29%2F%282-2Cos%28x%29%29+=+Cos%5E2\"$ $\"%28x%2F2%29\"$
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document.write( "We will work only with the left sides.\r\n" );
document.write( "Using the identity , \r\n" );
document.write( "we have  and so we\r\n" );
document.write( "replace  by \r\n" );
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document.write( "Factor the numerator as the difference perfect \r\n" );
document.write( "squares, and factor 2 out of the denominator:\r\n" );
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document.write( "Cancel the  factors:\r\n" );
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document.write( "Now we use the identity \r\n" );
document.write( "by letting .  This gives \r\n" );
document.write( "or . So we substitute that\r\n" );
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document.write( "Edwin

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