f(x)=cosx/5+sinx maka nilai dari f'(pi/6) =...

f(x)=1/5 cos x + sin x
f'(x)= -1/5 sin x + cos x
f'(π/6)= -1/5 sin 30 + cos 30
f'(π/6)= -1/5 • 1/2 + 1/2 √3
f'(π/6)=-1/10 + 1/2√3
f'(π/6)= (5√3 - 1) / 10