已知f(x)=x的2次方+sinx,则f′(π/3)的值应为?
问题描述:
已知f(x)=x的2次方+sinx,则f′(π/3)的值应为?
答
3分之2pai+2分之1
答
先对x求导,f′(x)=2x+cosx
x=π/3时,f′(π/3)=2π/3+cos(π/3)=(3+4π)/6
答
f(x)=x的2次方+sinx
f‘(x)=2x+cosx
f'(π/3)=2π/3+cos(π/3)
=2π/3+1/2
答
f'(x)=2x+cosx,则f‘(π/3)=2*(π/3)+cos(π/3)=2π/3+1/2