Explanation Given: The plane cos z = sin ( x + y ) Concept Used: Gradient of a function f ( x , y , z ) at a point P ( x 0 , y 0 , z 0 ) is: ∇ f = f x ( x 0 , y 0 , z 0 ) i + f y ( x 0 , y 0 , z 0 ) j + f z ( x 0 , y 0 , z 0 ) k The standard equation of tangent plane to a surface S with equation f ( x , y , z ) = C at point P ( x 0 , y 0 , z 0 ) is f x ( x 0 , y 0 , z 0 ) ( x − x 0 ) + f y ( x 0 , y 0 , z 0 ) ( y − y 0 ) + f z ( x 0 , y 0 , z 0 ) ( z − z 0 ) = 0 Calculation: To find a unit vector, normal to the surface cos z = sin ( x + y ) at ( π 2 , π 2 , π 2 ) First, let f ( x , y , z ) = cos z − sin ( x + y ) Now, find the gradient vector of this function at the point ( π 2 , π 2 , π 2 ) , since gradient vector at any point is perpendicular to the surface at that point. Gradient of a function f ( x , y , z ) is ∇ f = f x ( x 0 , y 0 , z 0 ) i + f y ( x 0 , y 0 , z 0 ) j + f z ( x 0 , y 0 , z 0 ) k Thus, first find f x ( π 2 , π 2 , π 2 ) , f y ( π 2 , π 2 , π 2 ) , and f z ( π 2 , π 2 , π 2 ) as f x ( x , y , z ) = ∂ ∂ x ( cos z − sin ( x + y ) ) = ∂ ∂ x cos z − ∂ ∂ x sin ( x + y ) = 0 − cos ( x + y ) ∂ ∂ x ( x + y ) = − cos ( x + y ) , f y ( x , y , z ) = ∂ ∂ y ( cos z − sin ( x + y ) ) = ∂ ∂ y cos z − ∂ ∂ y sin ( x + y ) = 0 − cos ( x + y ) ∂ ∂ y ( x + y ) = − cos ( x + y ) and f z ( x , y , z ) = ∂ ∂ z ( cos z − sin ( x + y ) ) = ∂ ∂ z cos z − ∂ ∂ z sin ( x + y ) = − sin z − 0 = − sin z

7th Edition

ISBN: 9781524916817

Author: SMITH KARL J, STRAUSS MONTY J, TODA MAGDALENA DANIELE

Publisher: Kendall Hunt Publishing

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Chapter 11.6, Problem 19PS

To determine

To find a unit vector that is normal to the surface

cosz=sin(x+y) at (π2,π2,π2)

And to find the standard form of the equation of tangent plane to this surface at above point

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Chapter 11.6, Problem 18PS

Chapter 11.6, Problem 20PS

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To find a unit vector that is normal to the surface cos z = sin ( x + y ) at ( π 2 , π 2 , π 2 ) And to find the standard form of the equation of tangent plane to this surface at above point

Solution Summary: The author explains how to find a unit vector that is normal to the surface and the standard form of the equation of tangent plane to this surface.

Videos

To find a unit vector that is normal to the surface

cosz=sin(x+y) at (π2,π2,π2)

And to find the standard form of the equation of tangent plane to this surface at above point

Want to see the full answer?

Chapter 11 Solutions

To find a unit vector that is normal to the surface cos z = sin ( x + y ) at ( π 2 , π 2 , π 2 ) And to find the standard form of the equation of tangent plane to this surface at above point

Solution Summary: The author explains how to find a unit vector that is normal to the surface and the standard form of the equation of tangent plane to this surface.

Videos

To find a unit vector that is normal to the surface cosz=sin(x+y) at (π2,π2,π2) And to find the standard form of the equation of tangent plane to this surface at above point

Want to see the full answer?

Chapter 11 Solutions

To find a unit vector that is normal to the surface

cosz=sin(x+y) at (π2,π2,π2)

And to find the standard form of the equation of tangent plane to this surface at above point