回答:
说明:
使用以下标准差异规则:
我们得到以下结果:
回想起那个:
因此,你得到:
这意味着两个连锁规则。一旦上
E ^( - x / 5)的导数是什么?
Dy / dx = -1 / 5e ^( - x / 5)> y = e ^( - x / 5)dy / dx =(e ^( - x / 5))( - 1/5)dy / dx = -1 / 5E ^( - X / 5)
F(x)= sin(log_2(x))的导数是什么?
按链规则,f'(x)= cos(log_2x)cdot1 / {(ln2)x} = {cos(log_2x)} / {(ln2)x}注意:(log_bx)'= 1 / {(lnb)x }
函数y = sin(xy)的导数是什么?
Dy / dx =(ycos(xy))/(1-xcos(xy))使用隐式微分,乘积规则和链规则得到d / dxy = d / dxsin(xy)=> dy / dx = cos(xy)(d / dx(xy))= cos(xy)[x(d / dxy)+ y(d / dxx)] = cos(xy)(xdy / dx + y)= xcos(xy)dy / dx + ycos(xy)=> dy / dx-xcos(xy)dy / dx = ycos(xy)=> dy / dx(1-xcos(xy))= ycos(xy):. dy / dx =(ycos(xy))/(1-xcos(xy))