document.write( "Question 929305: Solve the equation:\r
\n" ); document.write( "\n" ); document.write( "cos 2ω + cos ω + 1 = 0\r
\n" ); document.write( "\n" ); document.write( "Find all solutions on [0,2π). \n" ); document.write( "
Algebra.Com's Answer #564329 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
Solve the equation:
\n" ); document.write( "cos 2ω + cos ω + 1 = 0
\n" ); document.write( "Find all solutions on [0,2π).
\n" ); document.write( "***
\n" ); document.write( "\"cos%282x%29%2Bcosx%2B1=0\"
\n" ); document.write( "\"cos%5E2%28x%29-sin%5E2%28x%29%2Bcosx%2B1=0\"
\n" ); document.write( "\"cos%5E2%28x%29-%281-cos%5E2%28x%29%29%2Bcosx%2B1=0\"
\n" ); document.write( "\"cos%5E2%28x%29-1%2Bcos%5E2%28x%29%2Bcosx%2B1=0\"
\n" ); document.write( "\"2cos%5E2%28x%29%2Bcosx=0\"
\n" ); document.write( "cosx(2cosx+1)=0
\n" ); document.write( "cosx=0
\n" ); document.write( "x=π/2, 2π/3
\n" ); document.write( "or
\n" ); document.write( "2cosx+1=0
\n" ); document.write( "cosx=-1/2
\n" ); document.write( "x=2π/3, 4π/3 (In quadrants II and III where cos<0)
\n" ); document.write( " \n" ); document.write( "
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