document.write( "Question 1058324: Prove
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Algebra.Com's Answer #673494 by Edwin McCravy(20060) $\"\"$ $\"About$

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document.write( "We work with the left side\r\n" );
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document.write( "The formula for  is\r\n" );
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document.write( "If we substitute  and \r\n" );
document.write( "in that formula\r\n" );
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document.write( "the right side is the the same as the left side of\r\n" );
document.write( "the identity we are to prove, so the left side is\r\n" );
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document.write( "which becomes\r\n" );
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document.write( "Edwin

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