y=2x^3-x^2+1,则函数在(1,2)处的切线斜率是
问题描述:
y=2x^3-x^2+1,则函数在(1,2)处的切线斜率是
答
y'=6x^2-2x
y'(1)=4
点(1,2)在曲线上,切线的斜率是4
切线为y=4(x-1)+2=4x-2