SOLUTION: 7 cos θ + 9 = -2 cos θ

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Question 806245: 7 cos θ + 9 = -2 cos θ
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
7 cos θ + 9 = -2 cos θ
9 cos θ + 9 = 0
cos θ = -1
θ = pi
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