can u help me to olve these questions?????????????

Question

Find the total differentiation of f(x,y) , increment z and determine
Whether or not f(x, y) is differentiable for f(x,y) = xy2

Answer 1

I think you need to put that in better English for what is an English-language web site.

But anyhow, f(x)=xy^2 is certainly differentiable everywhere.