Question

Diketahui fungsi f(x) = 4cos x + 2sin 2x
Nilai f’(1/6 π) = …

Answer 1

F(x) = 4cos x + 2 sin 2x
f'(x) = 4 -sin x + 2 cos 2x
f'(1/6Π) = 4 - sin 30 + 2 cos 60

f'(1/6Π) = 4. -1/2 + 2 . 1/2
f'(1/6Π) = -2 + 1
f'(1/6Π) = -1