differentiate ))

Hey I must say this is an awesome site!!

q1.) y = tanh ^ -1 (3x^5)

using chain rule.

u=3x^5 du/dx = 15x^4

y= tanh ^ -1 (u) dy/du = 1/1-u^2 . (u) >>> SO; 1/(1-3x^5)^2 . (u)

y' = (3x^5 / 1 - 9x^10) . (15x^4)

or should it just be

y' = 15x^4 / 1-9x^10