Consider the function below.

f(x) = 4x tan(x),

2

< x <

2

(a)Find the interval where the function is increasing. (Enter your answer using interval notation.)

Find the interval where the function is decreasing. (Enter your answer using interval notation.)

(b)Find the local minimum value.

(c)Find the interval where the function is concave up. (Enter your answer using interval notation.)

I am having troulbe firging out how to solve this promblem