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Input "f(X)=",Str1Input "Pt d'abscisse K:",Kreal(12,Str1,"X"->Str2String>Equ(Str1,Y1String>Equ(Str2,Y2{0,Y2(K)->Y2{0,1->L1LinReg(ax+b) Y2Equ>String(Y2,Str2sub(Str2,1,length(Str2)-3->Str2{0,K->L2{0,1->L1LinReg(ax+b) Y3Equ>String(Y3,Str3sub(Str3,1,length(Str3)-3->Str3{0,Y1(K)->L2{0,1->L1LinReg(ax+b) Y1Equ>String(Y1,Str1sub(Str1,1,length(Str1)-3->Str1Str2+"(X-"+Str3+")+"+Str1->Str3real(14,Str3->Str3real(19,"y="+Str30->P

Input "f(X)=",Str0real(12,Str0,"X"->Str1real(19,"f'(X)="+Str10->P

:Input "f(X)=",Str0:String►Equ(Str0,{Y1}:real(12,Str0,"X"→Str1:String►Equ(Str1,{Y2}:Lbl Zθ:real(19,"f'(X)="+Str1

Yes I use the "real(" token. I added Omnicalc on the calc (what about hooks cohabitation problems between Omnicalc and Symbolic ?).It doesn't work better for my program, and the other (Supramaths) still works great...

Omnicalc installs the Symbolic hooks.