Inverse of f(x) is 1/x^3. Take the derivative of it. Power rule for this one:
-3*1/x^(3+1) = -3/x^4
-3*1/x^(3+1) = -3/x^4
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y = x^(-1/3)
x = y^(-1/3)
1/x = y^(1/3)
x^(-3) = y
y = x^(-3)
dy/dx = -3 * x^(-4)
dy/dx = -3 / x^4
x = y^(-1/3)
1/x = y^(1/3)
x^(-3) = y
y = x^(-3)
dy/dx = -3 * x^(-4)
dy/dx = -3 / x^4
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hmmm difficult one