SOLUTION: Solve the equation for theta by writing the sum of the two cosines as a product. Equation: cos(2theta) + cos(theta) = 0

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Question 1088743: Solve the equation for theta by writing the sum of the two cosines as a product.
Equation: cos(2theta) + cos(theta) = 0
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
cos%5E2%28theta%29%2Bcos%28theta%29=0
cos%28theta%29%28cos%28theta%29%2B1%29=0
So then,
cos%28theta%29=0
theta=pi%2F2 and theta=%283%2F2%29pi
and
cos%28theta%29%2B1=0
cos%28theta%29=-1
theta=pi
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