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6. (4 pts) Find all solutions of the equation 4cos(3θ+4π)+2=0 in the interval [0,2π].
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6. (4 pts) Find all solutions of the equation 4cos(3θ+4π)+2=0 in the interval [0,2π].
6. (4 pts) Find all solutions of the equation 4cos(3θ+4π)+2=0 in the interval [0,2π].
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