find dy/dx at x=2 if y=6u^2-11and u=3x^2+2

问题描述:

find dy/dx at x=2 if y=6u^2-11and u=3x^2+2

dy/dx = (6u^2-11)' = 12uu' = 12(3x^2+2)(3x^2+2)' = 12(3x^2+2)*6x
x=2时,dy/dx = 12*14*12=2016