Find the intervals on which f is increasing and decreasing. f(X) = 6 cos (3x) on [- 1,1) Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. O A. fis increasing on fis never decreasing. (Simplify your answer. Use a comma to separate answers as needed. Type your answers in interval notation. Type an exact answer, using n as needed. Use integers or fractions for any numbers in the expression.) O B. fis decreasing on .fis never increasing. (Simplify your answer. Use a comma to separate answers as needed. Type your answers in interval notation. Type an exact answer, using x as needed. Use integers or fractions for any numbers in the expression.) OC. fis decreasing onO and fis increasing on. (Simplify your answers. Use a comma to separate answers as needed. Type your answers in interval notation. Type an exact answer, using x as needed. Use integers or fractions for any numbers in the expression.) O D. fis never increasing or decreasing.

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