大学数学导数什么的导数是f'(x)+2f(x)/x
2019-05-27
大学数学导数
什么的导数是f'(x)+2f(x)/x
优质解答
只需时刻记住这是对 x 求的导数:
x = a(t-sint),y = a(1-cost),
求一阶导数,得
dy/dx = (dy/dt)/(dx/dt) = (asint)/[a(1-cost)] = sint/(1-cost),
再求第二阶导数,得
d²y/dx² = [(dy/dx)/dt]/(dx/dt)
= {d[sint/(1-cost)]/dt}/(dx/dt)
= …….
只需时刻记住这是对 x 求的导数:
x = a(t-sint),y = a(1-cost),
求一阶导数,得
dy/dx = (dy/dt)/(dx/dt) = (asint)/[a(1-cost)] = sint/(1-cost),
再求第二阶导数,得
d²y/dx² = [(dy/dx)/dt]/(dx/dt)
= {d[sint/(1-cost)]/dt}/(dx/dt)
= …….