document.write( "Question 310834: Prove the identity: $\"2Cos%5E2x+-1+=+Cos%5E2x+-Sin%5E2x\"$ \n" ); document.write( "

Algebra.Com's Answer #222305 by Edwin McCravy(20060) $\"\"$ $\"About$

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Prove the identity:\r
\n" ); document.write( "\n" ); document.write( " $\"2Cos%5E2x+-1+=+Cos%5E2x+-Sin%5E2x\"$
\n" ); document.write( " $\"2Cos%5E2x+-1+=+Cos%5E2x+-%281-Cos%5E2x%29\"$
\n" ); document.write( " $\"2Cos%5E2x+-1+=+Cos%5E2x+-1%2BCos%5E2x\"$
\n" ); document.write( " $\"2Cos%5E2x+-1+=+2Cos%5E2x+-1\"$
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