review your 1st and 2nd derivative meanings
f' = -6(1+sinx)cosx
f" = 6(sinx-cos(2x))
If f(x) = 3 cos^2(x) − 6 sin(x) 0 ≤ x ≤ 2π
Find the intervals of increase and decrease, the intervals of concave up and concave down, local
maximum values, local minimum values, and inflection point
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