document.write( "Question 743369: Please help me verify the identity:
\n" ); document.write( "1-tan^2t/1+tan^2t= 2cos^2-1. \n" ); document.write( "

Algebra.Com's Answer #452931 by lwsshak3(11628) $\"\"$ $\"About$

You can put this solution on YOUR website!
Please help me verify the identity:
\n" ); document.write( " $\"%281-tan%5E2%28t%29%29%2F%281%2Btan%5E2%28t%29%29=+2cos%5E2%28t%29-1\"$
\n" ); document.write( "start with left side:
\n" ); document.write( " $\"%281-tan%5E2%28t%29%29%2F%281%2Btan%5E2%28t%29%29\"$
\n" ); document.write( " $\"%281-sin%5E2%28t%29%2Fcos%5E2%28t%29%29%2F%281%2Bsin%5E2%28t%29%2Fcos%5E2%28t%29%29\"$
\n" ); document.write( "

\n" ); document.write( "verified: left side=right side \n" ); document.write( "

\n" );