3D APP & diferentials

02102019, 09:47 AM
Post: #1




3D APP & diferentials
Hello
I do not find a way to plot the diferential of a function with 2 variables. The goal is to see the plane tangent in a point to a surface. For example z= 2*x*y/(x^2+y^2). I change to capital letters when I put the function in the 3D APP and I asigned to FZ1. Then I put in the next d(FZ1)/dX. It plots nothing. Then I derivate in CAS. It gives me the correct answer. I can plot it. It should be substituted in a point and I suppose then I will get the plane. But, can you help me with a method to derivate directly in the APP? What I am doing wrong? I attach some screenshots. I hope it works, [/php] Thanks to all off you Toni 

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