(Enter your answers using interval notation. Round your answers to two decimal places.)

f(x) = 8 sin(x) + cot(x), − ≤ x ≤

Find the interval(s) of increase.

Find the interval(s) of decrease.

Find the inflection points of the function.

Find the interval(s) where the function is concave up.

Find the interval(s) where the function is concave down.