document.write( "Question 204685: Can you help me solve this trigonometric identities question: 1)Prove each of the following identities.
\n" ); document.write( "a)cos^2 x +2sin^2 x -1=sin^2 x \n" ); document.write( "

Algebra.Com's Answer #160626 by HyperBrain(694) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( "But, $\"sin%5E2%28x%29%2Bcos%5E2%28x%29=1\"$ . So
\n" ); document.write( " $\"cos%5E2+%28x%29+%2B+sin%5E2+%28x%29%2B+sin%5E2+%28x%29+-+1=1+%2B+sin%5E2%28x%29+-+1\"$
\n" ); document.write( "= $\"sin%5E2%28x%29+%2B+1+-1\"$
\n" ); document.write( "= $\"sin%5E2%28x%29\"$ \n" ); document.write( "

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