3. Consider the ellipsoid x2 + 4y2 + z? = 18. Find the acute angle that the tangent plane at the point (1, 2, 1) makes with the xy – plane. Solution: To find the acute angle 0 between the tangent plane and the xy – plane, we have n1 = n = (2,16, 2) and n2 = (0,0, 1). This yields %3D In1 n2| ||n1||n2|| (2,16,2)-(0,0,1)| || (2,16,2)||||(0,0,1)|| cosê = cosê = (2v66)(1) V66 -1 COS 0 = 83° 66.

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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Can you explain to me how the N2= was obtained
3. Consider the ellipsoid x2 + 4y² + z² = 18.
Find the acute angle that the tangent plane at the point (1, 2, 1)
makes with the xy – plane.
Solution:
To find the acute angle 0 between the tangent plane and the
xy – plane, we have n1 = n = (2, 16, 2) and n2 = (0,0, 1).
This yields
-
%3D
|n1 n2||
n||n2|||
|(2,16,2):(0,0,1)|
I| (2,16,2)|||(0,0,1)||
cos0 =
cos0 =
2
(2v66)(1)
1
V66
, 0 = 83°
-1
0 = cos
%3D
66
Transcribed Image Text:3. Consider the ellipsoid x2 + 4y² + z² = 18. Find the acute angle that the tangent plane at the point (1, 2, 1) makes with the xy – plane. Solution: To find the acute angle 0 between the tangent plane and the xy – plane, we have n1 = n = (2, 16, 2) and n2 = (0,0, 1). This yields - %3D |n1 n2|| n||n2||| |(2,16,2):(0,0,1)| I| (2,16,2)|||(0,0,1)|| cos0 = cos0 = 2 (2v66)(1) 1 V66 , 0 = 83° -1 0 = cos %3D 66
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