- #1

EL ALEM

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## Homework Statement

Show that if f(x)=sinx then (f(x+h)-f(x))/h=((sin(h/2))/(h/2))(cos(x+h/2)

## Homework Equations

Trig identities, possibly the half angle formulas?

## The Attempt at a Solution

(f(x+h)-f(x))/h

= (f(x+ h/2 + h/2)-f(x))/(h/2 + h/2)

= (sin(x+ h/2 + h/2)-sin(x))/(h/2 + h/2)

im stuck after this, don't know what to do..