Define f: R² → R by sin(ry) f(x,y) := TY if ry # 0, f(t,0) = 1 = f(0, t) Vt e R. Prove that f is continuous at all points of R?.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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(a) Define f: R² → R by
sin(ry) if ry + 0,
f(x, y) :
if xy + 0,
f(t,0) = 1 = f (0, t) Vt e R.
xy
Prove that f is continuous at all points of R?.
(b) Given a continuous function g: R? → R and a bounded function h: R? → R, define a function
F: R² → R as the product of g and h. Thus F(x, y) := (g(x, y)) (h(x,y)). Prove that if g(a, b) = 0
then F is continuous at (a, b) E R².
Transcribed Image Text:(a) Define f: R² → R by sin(ry) if ry + 0, f(x, y) : if xy + 0, f(t,0) = 1 = f (0, t) Vt e R. xy Prove that f is continuous at all points of R?. (b) Given a continuous function g: R? → R and a bounded function h: R? → R, define a function F: R² → R as the product of g and h. Thus F(x, y) := (g(x, y)) (h(x,y)). Prove that if g(a, b) = 0 then F is continuous at (a, b) E R².
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