Find d derivative of f(x) = sec (ax+b) using first principle derivative method - Maths - Limits and Derivatives

Question

Find d derivative of f(x) = sec (ax+b) using first principle
derivative method?

Samarth Singh Baghel · Answer

please explain the first principle derivative method to me
also????

Find d derivative of f(x) = sec (ax+b) using first principle derivative method?