document.write( "Question 1180927: https://gyazo.com/adf6b2eb47c84dfcb40621be331f0cb2\r
\n" ); document.write( "\n" ); document.write( "with steps please \n" ); document.write( "

Algebra.Com's Answer #810744 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( " $\"2cos%5E2%284x%29-1\"$ \r
\n" ); document.write( "\n" ); document.write( "use identity\r
\n" ); document.write( "\n" ); document.write( " $\"2cos%5E2%28alpha%29+-1=cos%282alpha%29\"$
\n" ); document.write( "in your case $\"alpha=4x\"$ \r
\n" ); document.write( "\n" ); document.write( "= $\"cos%282%2A4x%29\"$ \r
\n" ); document.write( "\n" ); document.write( "= $\"cos%288x%29\"$ \n" ); document.write( "

\n" );