document.write( "Question 986691: Sin^4x-cos^4x=1-2cos^2x \n" ); document.write( "
Algebra.Com's Answer #607505 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
Sin^4x-cos^4x=1-2cos^2x
\n" ); document.write( "=============================
\n" ); document.write( "You didn't say what you want to do.
\n" ); document.write( "
\n" );