I tried doing 2 questions here which I fail to get the answer.
f(x) = tan(1-3x)
f'(x) = -3 sec^2 (1-3x)
By using the integration technique, that is ,
∫f(x)^n * f'(x) = f(x)^(n+1) /(n+1) + c
(1/ (-3sec^2 (1-3x)) * ( tan(1-3x)^3 / 3).
I know something is wrong somewhere, because the answer is
2) The same goes to the second question, ∫ .