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For some unknown function f(x), the first derivative of the function is given by f(x)= 2cos(3x)-1.

4. For some unknown function f(x), the first derivative of the function is given by f(x)= 2cos(3x)-1. Show ALL the algebra/trigonometry needed to find all intervals (in interval notation) where f(x)is increasing and all intervals where f(x) is decreasing on [0,2π). Include a sign graph of + and - signs to support your answer.

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