Question: please explain. I understand the first step is to take the derivative and then equal to zero, but after that I'm unsure how to go

please explain. I understand the first step is to take the derivative and then equal to zero, but after that I'm unsure how to go about this problem.

Find the critical points of the function 4sin r cos (I) contained in the interval (0, 27) Use a comma to separate multiple critical points. Enter an exact
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