Question

Jika f(x) = sin x. cos 3x, maka f'(π/6) =

Answer 1

F(x) = sinx . cos3x
= cos'x . sin'3x

f(pi/6) = cos'(pi/6) . sin'3(pi/6)
= cos'(pi/6) . sin'(pi/2)

mungkin begitu..