6. Derivatives of Inverse, Exponential, & Logarithmic Functions

In Exercises 7–38, find the derivative of y with respect to x, t, or θ, as appropriate.

25. y = ln(ln(x))

Use differentiation to verify each equation.

d/dx (x⁴ − ln(x⁴ + 1))=4x⁷ / (1 + x⁴).