Question: y=3x-2tan(x) Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does

y=3x-2tan(x)

Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.)

The domain is from (-pi/2,pi/2)

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