The limit of f(x, y) as y → 0 along the path a x=y is 1. The limit of f(x, y) as y → 0 along the path z = y² is 1. • ƒ(0,0) = 2. Which of the following statements must be true?
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- If a functionfis increasing on (a,b) and decreasing on (b,c) , then what can be said about the local extremum offon (a,c) ?A function h(x, y) is defined by h(x,y)=(x^2 y)/(〖7x〗^6+y^3 ). Verify the limit over h(x, y) exists at the origin along y = x^2? In either case write also the reason.What does it mean for a function ƒ(x, y) to have limit L as (x, y) S (x0 , y0)?
- Show that f(x,y) limit exists at (0,0) using epsilon-delta.Let f(x, y) = xy /(x 2 + y2). Show that f(x, y) approaches zero along the x- and y-axes. Then prove that lim f(x, y) does not exist by (x,y) (0,0)showing that the limit along the line y =xis nonzero.Prove that the limit of xy[(x^2 - y^2)/(x^2 + y^2)] is zero as (x, y) goes to (0,0)
- Let f (x, y) = xy/(x2 + y2). Show that f (x, y) approaches zeroalong the x- and y-axes. Then prove that lim (x,y)→(0,0)f (x, y) does not exist by showing that the limit along the line y = x is nonzero.Show that the function f (x, y)=(2 + x-y) / [1+ 2x ^ 2)+(3y ^ 2)] ∈R has a limit at (0,0).Calculate the value of the limit lim(x,y)→(0,0) 22xy/x^2+y^2 as we approach (0,0) along the path γ(t)=(−t,t).
- compute dy/dx using the limit definition. y = 4 − x2Let a function f(x,y)=(x^2+2xy+y^2)/(x^2+y^2 ), find the limit over f(x,y) along the path(a) x-axis(b) y-axis(c) y = mx(d) y = x^2Show that the function f(x,y)=x^4y/x^8+y^4 does not have a limit at (0,0) by examining the following limits. (a) Find the limit of f as (x,y)→(0,0) along the line y=x (b) Find the limit of f as (x,y)→(0,0) along the curve y=x^4