Show that if x and y are real numbers, x2 + y2 >= 2xy and
(x + y)2 >= 4xy; When does equality hold (with proof)?
QUESTION 2 Calculate and simplify det if f(x,y) = O x2 - y2 + 2xy (x2 + y2)2 O 4x(+- x² + 3y2) (x² + y²)3 o 4x(x² – 3y?) (x² + y²)3 OO O x2 - y2 + 2xy (x² + y²)?
1. Find lim(x,y)=(1,1) x2-y2 2xy 2. Show that lim(x,y)-(0,0) 21 z does not exist 3. Show that lim(x,y)=(0,0) z?”, does not exist 4. Find lim(x,y)=(0,0) eye if it exists, or show that the limit does not exist
Exercise 4.7.4. Let x,y be real numbers such that x2+y2 = 1. Show that there is exactly (Hint: you may need to divide into cases depending on whether x, y are positive negative, or zero.) one real number 0 e (-7r,7r such that r sin(0) and y cos(0) Exercise 4.7.4. Let x,y be real numbers such that x2+y2 = 1. Show that there is exactly (Hint: you may need to divide into cases depending on whether x, y are positive...
Find the P.S. of the IVP: x2 + 2xy + y2 1+ (x + y)2 y(x = 0) = 4 Primes denote derivatives WRT X. (y'a
f(x, y) = x2 + y2 + 2xy + 6. 1- Find all the local extremas and 2) does the function f have an absolute max or min on R2
Find the general solution of x2 y' = y2 + 2xy
1. (You may use the fact that 2xy ++ y2 for all real 2 and y.) a. Show that the function f : E→ El defined by f(x, y) = y) if (r, y) + (0,0) 10 if (2,y) = (0,0) is a continuous function on all of E. b. Prove that the same function is uniformly continuous on the closed ball of radius 100 around the origin in E2. c. Show that the same function is not uniformly continuous...
2. A) Calculate the work done by the field } = (x² - y2,-2xy) when moving an object from the origin to the point (1, 2) along the path C: x = t?, y = 2t. B) Use a Theorem from 16.3 to determine whether or not F = (x2 - y2,-2xy) is a conservative vector field. C) Deduce the work done by the field } = (x2 - y2,-2xy) moving an object from the point (1, 2) to the...
y? - 2xy x + y2 if (x, y) + (0,0) 7. Given the piecewise function: f(x,y) 0 if (x, y) = (0,0) a) Show that: limf(x,y) does not exist. *(x,y) (0,0) b) Find: fy(0,0). c) Where is f continuous? Where is f differentiable? Explain.
Show all work. 1. Find two nonnegative real numbers x and y such that x + y = 24 and x2 + y2 is maximized and show why it is a maximum using calculus. 3. The length of a rectangle is decreasing at a rate of 2 cm/sec, while the width wis increasing at the rate of 3 cm/sec. At the moment when the length / is 12 cm and the width wis 5 cm, find the rate at which...