1) f'(x)=(x²-4x+1)'=2x-4
1) f(1)=1²-4*1=-3
2) f'(x)=(cos x+sin x)'=-sinx+cosx
f'(π/4)=cos π/4-sinπ/4=√2/2-√2/2=0
3) f'(x)=(2x+√x)'=2+1/(2√x)
f'(9)=2+1/(2√9)=2 1/6
1) f'(x)=(x²-4x+1)'=2x-4
1) f(1)=1²-4*1=-3
2) f'(x)=(cos x+sin x)'=-sinx+cosx
f'(π/4)=cos π/4-sinπ/4=√2/2-√2/2=0
3) f'(x)=(2x+√x)'=2+1/(2√x)
f'(9)=2+1/(2√9)=2 1/6