mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?y[x_] := x + 9.81/2*x*xk=1X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5Plot[{y[x],Y[X],},{x,0,2}]

问题描述:

mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?
y[x_] := x + 9.81/2*x*x
k=1
X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5
Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5
Plot[{y[x],Y[X],},{x,0,2}]