document.write( "Question 865061: Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)
\n" ); document.write( "cos (2θ) = cos^2 θ − (1/2)
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #521484 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)
\n" ); document.write( "For interval (0,2π)
\n" ); document.write( "cos (2θ) = cos^2 θ − (1/2)
\n" ); document.write( "cos^2 θ -sin^2 θ =cos^2 θ -1/2
\n" ); document.write( "sin^2 θ =1/2
\n" ); document.write( "sin θ =±1/√2=±√2/2
\n" ); document.write( "θ =π/4, 3π/4, 5π/4, 7π/4 \n" ); document.write( "
\n" );