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Find the intervals on which f is increasing and decreasing.
f(x) = 4 cos (4x) on [ - 3π/4, 3π/4 ]
Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice.
f is decreasing on__and f is increasing on___
(Simplify your answers. Use a comma to separate answers as needed. Type your answers in interval notation. Type an exact answer, using as needed. Use integers or fractions for any numbers in the expression.)

Sagot :

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