Tasand: erinevus redaktsioonide vahel

:<math>\,\frac{\partial F(a,b,c)}{\partial x} (x-a) + \frac{\partial F(a,b,c)}{\partial y}(y-b) + \frac{\partial F(a,b,c)}{\partial z}(z-c) = 0 \, ,</math>

 

 

:<math>(\vec r-\vec r_0)\cdot\vec \nabla F(\vec r_0) = 0 \, .</math>