document.write( "Question 1088743: Solve the equation for theta by writing the sum of the two cosines as a product.
\n" ); document.write( "Equation: cos(2theta) + cos(theta) = 0 \n" ); document.write( "

Algebra.Com's Answer #703054 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"cos%5E2%28theta%29%2Bcos%28theta%29=0\"$
\n" ); document.write( " $\"cos%28theta%29%28cos%28theta%29%2B1%29=0\"$
\n" ); document.write( "So then,
\n" ); document.write( " $\"cos%28theta%29=0\"$
\n" ); document.write( " $\"theta=pi%2F2\"$ and $\"theta=%283%2F2%29pi\"$
\n" ); document.write( "and
\n" ); document.write( " $\"cos%28theta%29%2B1=0\"$
\n" ); document.write( " $\"cos%28theta%29=-1\"$
\n" ); document.write( " $\"theta=pi\"$
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