i keep on doing something wrong on this problem,i guess im forgetting to add or subtract some number.
use f'(x)=lim h-->0 f(x+h)-f(x)/h
to find the limit: lim h-->0
sin^(3)4(x+h)-sin^(3)4x/h
use f'(x)=lim h-->0 f(x+h)-f(x)/h
to find the limit: lim h-->0
sin^(3)4(x+h)-sin^(3)4x/h