1. Find the derivative of the function f(x) = 5x^3 - 2x^2 + 4x - 7.
2. Calculate the derivative of g(x) = sin(x) + cos(x).
3. Determine the derivative of h(x) = ln(x^2 + 1).
4. Find the derivative of the function k(x) = 3x^4 - 8x^3 + 6x^2 - 2x + 1.
5. Calculate the derivative of the function m(x) = tan(x) - sec(x) + csc(x).