y=1/x^2(x>0) y=(1-x)/(1+x) y=(e^x-e^-x)/2
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设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于?
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}]
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