Consider the following. (If an answer does not exist, enter DNE.) f(x) = sin?(x) – cos(2x), Find the interval(s) on which f is concave up. (Enter your answer using interval notation.) Find the interval(s) on which f is concave down. (Enter your answer using interval notation.) Find the inflection points of f. smaller x-value (х, у) %3D larger x-value (х, у) %3D

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