Find the directions in which t and decrease most rapidly at function in those directions.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Ques 6
xy
3. Let f(x, y) =+y3n (X,y) # (0,0)
(x, y) (0,0)
where n> 1.
%3D
%3D
Discuss the continuity of f(x,y). And show that f(x,y) and f,(x, y) exist at all
points (x, y).
4. Find the equation of parabola which has axis parallel to y-axis and which passes
through the points (0, 2), (-1,0) and (1, 6).
An ellipse circumscribes a rectangle whose sides are given by x = ±2 and y = 4. If
the distance between the foci is 4V6 and major axis is along y-axis, then find the
equation of the ellipse.
%3D
5. If
w = In(x? + y2 + z?), x = ue" sin u, y = ue" cos u and z =
ue",
find
%3D
aw
aw
and
using chain rule at the point (u, v) = (-2,0).
dv
п
6. Find the directions in which the function f(x, y,z) = In xy + In yz + In xz increase
and decrease most rapidly at the point Po(1,1,1). Then find the derivatives of the
function in those directions.
Transcribed Image Text:xy 3. Let f(x, y) =+y3n (X,y) # (0,0) (x, y) (0,0) where n> 1. %3D %3D Discuss the continuity of f(x,y). And show that f(x,y) and f,(x, y) exist at all points (x, y). 4. Find the equation of parabola which has axis parallel to y-axis and which passes through the points (0, 2), (-1,0) and (1, 6). An ellipse circumscribes a rectangle whose sides are given by x = ±2 and y = 4. If the distance between the foci is 4V6 and major axis is along y-axis, then find the equation of the ellipse. %3D 5. If w = In(x? + y2 + z?), x = ue" sin u, y = ue" cos u and z = ue", find %3D aw aw and using chain rule at the point (u, v) = (-2,0). dv п 6. Find the directions in which the function f(x, y,z) = In xy + In yz + In xz increase and decrease most rapidly at the point Po(1,1,1). Then find the derivatives of the function in those directions.
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