What is the extreme f(x,y)=(sin(x-y))/(|x|+|y|) ?

The extreme f(x,y)=(sin(x-y))/(|x|+|y|) is None

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extreme f(x,y)=(sin(x-y))/(|x|+|y|)

extreme points

f (x, y) = \frac{sin ( x - y )}{∣ x ∣ + ∣ y ∣}

None

Solution steps

Find the critical points:

None

f (x)

has no critical points, therefore there are no extreme points

None

f (x) = \frac{x}{5 x - 4}, 6 \leq x \leq 7

f (x) = 4 x^{\frac{10}{3}} - 10 x^{\frac{4}{3}}

f (x) = y - y^{2}

f (x) = 4 x^{2} - 6 x y + 5 y^{2} - 20 x + 26 y

f (x) = - 1.6

What is the extreme f(x,y)=(sin(x-y))/(|x|+|y|) ?
The extreme f(x,y)=(sin(x-y))/(|x|+|y|) is None