Find a big - O estimate for the following function such that f (n) is 0 (g (n)) and g (n) is a simple function of the smallest order. Show your work. f (n) = (n^2 + n log (n^3)) (n^3 + n middot 3^n) + (5 middot 2^n + 1.9^n + 1)(3 n^2 + 5 n log n)