(1)f'(x)=3x^2-1,k=2,y-2=2(x-1)
(2)由f'(x),f(x)在[-1,-√3/3)和(√3/3,1]上单增,在[-√3/3,√3/3]上单减
f(-1)=a,f(-√3/3)=2√3/9+a,f(√3/3)=-2√3/9+a,f(1)=a
|f(x1)-f(x2)|最大=4√3/9
(1)f'(x)=3x^2-1,k=2,y-2=2(x-1)
(2)由f'(x),f(x)在[-1,-√3/3)和(√3/3,1]上单增,在[-√3/3,√3/3]上单减
f(-1)=a,f(-√3/3)=2√3/9+a,f(√3/3)=-2√3/9+a,f(1)=a
|f(x1)-f(x2)|最大=4√3/9