jawaban beserta pembahasan f(x)=1/4 sin 1/4x. f'(x) =...?

variabel x dianggap pembilang
f(x) = (1/4) sin(x/4)
misal u = x/4
f'(x) = (1/4) d(sin u)/du . d(x/4)/dx
= (1/4) cos u . (1/4)
= (1/16) cos(x/4)