Question

derivate 3x^3-(8x^3/4divided by 3)-3/x^3

Answer 1

For x^k for any real number k, the derivative is k*x^(k-1).
Use that here. Also use that the derivative of g(x) = c*f(x) is just c*f'(x).

Answer 2

You might have to convert 3/x^3 to 3*x^(-3)