If f(x) = 9x10 tan−1x, find f '(x). 90x9tan−1x + 9x10 1 over the quantity 1 plus x squared

90x9tan−1x + 9x10tan−2x

90x9tan−1x − 9x10 1 over the square root of the quantity 1 minus x squared

90x9tan−1x + 9x10 1 over the square root of the quantity 1 minus x squared

those are my choices