Zero directional derivative In what directions is the

Chapter 13, Problem 32E

(choose chapter or problem)

Zero directional derivative

In what directions is the derivative of $f(x, y)=\left(x^{2}-y^{2}\right) /\left(x^{2}+y^{2}\right)$ at $P(1, 1)$ equal to zero?

Equation Transcription:

$f(x,y)=({x}^{2}-{y}^{2})/({x}^{2}+{y}^{2})$

$P(1,\ 1)$

Text Transcription:

f(x,y)=(x^2-y^2)/(x^2+y^2)

P(1, 1)

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