document.write( "Question 402561: verify the identity:
\n" ); document.write( "(cos^2x)-(sin^2x)=(1-2sin^2X) \n" ); document.write( "

Algebra.Com's Answer #284739 by richard1234(7193) $\"\"$ $\"About$

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Using the identity $\"cos%5E2%28x%29+%2B+sin%5E2%28x%29+=+1\"$ , if we subtract $\"2sin%5E2%28x%29\"$ from both sides, we obtain $\"cos%5E2%28x%29+-+sin%5E2%28x%29+=+1+-+2sin%5E2%28x%29\"$ and we're done. \n" ); document.write( "

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