(d) The function x²+y? Vx2+y? (x, y) # (0,0) f(x, y) (x, y) = (0,0) is continuous at (0,0).

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I need d) e) and f) I already did a) b) and c). Written clearly please thank you

Determine whether each of the following state-
ments is true or false and justify your response. You may
justify with a simple computation, but if there is no rele-
vant computation to show, give a brief written explanation.
(a) The vectors (2, 1, 3) and (1, 1, –1) are orthogonal.
V2 V2
(b) The cross product of (-,-, ) and ( v v2
2
2
is a unit vector
[1 2 0
(c) The matrix 1
1
0 1 is invertible.
2 2 2
(d) The function
x²+y²
x²+y?
2
(x, y) # (0,0)
f(x, y)
(x, y) = (0,0)
6.
is continuous at (0,0).
(e) There is a twice differentiable function f: R? → R such
that fx = x²y and fy = xy².
(f) The curve c(t) = (e' cos(t), et sin(t), e') is an integral
curve of the vector field F(x, y, z) = -yi+ xj+ zk.
Transcribed Image Text:Determine whether each of the following state- ments is true or false and justify your response. You may justify with a simple computation, but if there is no rele- vant computation to show, give a brief written explanation. (a) The vectors (2, 1, 3) and (1, 1, –1) are orthogonal. V2 V2 (b) The cross product of (-,-, ) and ( v v2 2 2 is a unit vector [1 2 0 (c) The matrix 1 1 0 1 is invertible. 2 2 2 (d) The function x²+y² x²+y? 2 (x, y) # (0,0) f(x, y) (x, y) = (0,0) 6. is continuous at (0,0). (e) There is a twice differentiable function f: R? → R such that fx = x²y and fy = xy². (f) The curve c(t) = (e' cos(t), et sin(t), e') is an integral curve of the vector field F(x, y, z) = -yi+ xj+ zk.
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