x=acos^3 t y=asin^3 t

问题描述:

x=acos^3 t y=asin^3 t

x=acos^3 t y=asin^3 t
dy/dx=(dy/dt)/(dx/dt)
dy/dt=3asin^2 tcost
dx/dt=-3scos^2tsint
dy/dx=3asin^2 tcost/(-3scos^2tsint)
=-tant