Y(t)=3t^2-3t X(t)=4t^2-6t^3+5t 求Y(x)=?
问题描述：
Y(t)=3t^2-3t X(t)=4t^2-6t^3+5t 求Y(x)=?
答
Y(t)=3t(t-1)
X(t)=-t(6t^2-4t-5)=
Y(x)=-3t(6t^2-4t-5)(4t^2-6t^3+5t-1)