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Find the critical points and inflection points. Determine the local extrema and the intervals where the function is concave upward and concave downward. (a) f(x)

Find the critical points and inflection points. Determine the local extrema and the intervals where the function is concave upward and concave downward.

(a) f(x) = 4xe^(3x) (b) f(x)=xsin(x),x[/2, 3/2]

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