Produce graphs of f that reveal all the important aspects of the curve. then use calculus to find the following. (enter your answers using interval notation. round your answers to two decimal places.) f(x) = 4 sin(x) + cot(x), −π ≤ x ≤ π find the interval of increase. find the interval of decrease. find the inflection points of the function. (x, y) = (smaller x-value) (x, y) = (larger x-value) find the interval where the function is concave up. find the interval where the function is concave down.