Solve the equation for exact solutions over the interval [0, 21).7 cosx+14 cos x +...

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Solve the equation for exact solutions over the interval [0, 21).7 cosx+14 cos x + 7 = 0Select the correct choice below and, if necessary, fill in the answer box tocomplete your choice.A. The solution set is(Type an exact answer, using as needed. Type your answer inradians. Use integers or fractions for any numbers in the expressUse a comma to separate answers as needed.)B. The solution is the empty set.

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