- #1

PedroB

- 16

- 0

## Homework Statement

Find the derivative of the function f(x)=cos(√x) by first principles

## Homework Equations

f'(x)= lim as h tends to zero of [f(x+h)-f(x)]/h

## The Attempt at a Solution

Problems arise immediately, since I have no idea what to do with the expression cos(√(x+h)), I've tried binomial expansion, but to no avail. Any help would be greatly appreciated