If f(x) = 5x4 tan−1x, find f '(x). 20x3tan−1x − 5x4tan−2x
20x3tan−1x + 5x4 1 over the square root of the quantity 1 minus x squared
20x3tan−1x − 5x4 1 over the square root of the quantity 1 minus x squared
20x3tan−1x + 5x4 1 over the quantity 1 plus x squared