Question: Explain why the function is differentiable at the given point. f ( x , y ) = y t a n ( x ) ,

Explain why the function is differentiable at the given point.
f(x,y)=ytan(x),(4,4)
The partial derivatives are fx(x,y)= and fy(x,y)=, so fx(4,4)= and fn(4,4)=(4,4).
Find the linearization L(x,y) of the function at (4,4).
L(x,y)=L
Explain why the function is differentiable at the

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