SOLUTION: Solve the following equation in the interval [0, 2pi]. Give the answer as a multiple of pi. Do not use decimal numbers. The answer should be a fraction or an integer. 2(cos(t))^

Question 928167: Solve the following equation in the interval [0, 2pi].
Give the answer as a multiple of pi. Do not use decimal numbers. The answer should be a fraction or an integer.
2(cos(t))^2-cos(t)-1=0
Help would be appreciated.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Substitute,

Then,

Two "u" solutions:

and

and

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