SOLUTION: Find all t in the interval [0, 2π] satisfying (cos t)2 + 4 cos t + 3 = 0. (Enter your answers as a comma-separated list.)

SOLUTION: Find all t in the interval [0, 2π] satisfying (cos t)2 + 4 cos t + 3 = 0. (Enter your answers as a comma-separated list.)

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Question 493016: Find all t in the interval [0, 2π] satisfying (cos t)2 + 4 cos t + 3 = 0. (Enter your answers as a comma-separated list.)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Sub x for cos(t)
Solve for x
Sub cos(t) for x.
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