In Exercises 47–52, sketch the level curves c = −3, −2, −1, 0,1, 2, 3 if they exist for the specified function. 48. f (x, y) = x2 − y249. f (x, y) = sin(x + y) 50. f (x, y) = cos(xy)51. f (x, y) = y csc x 52. f (x, y) = y sec x

In Exercises 47–52, sketch the level curves c = −3, −2, −1, 0,1, 2, 3 if they exist for the specified function. 48. f (x, y) = x2 − y249. f (x, y) = sin(x + y) 50. f (x, y) = cos(xy)51. f (x, y) = y csc x 52. f (x, y) = y sec x

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter14: Discrete Dynamical Systems

Section14.3: Determining Stability

Problem 1YT

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Question

In Exercises 47–52, sketch the level curves c = −3, −2, −1, 0,
1, 2, 3 if they exist for the specified function.

48. f (x, y) = x² − y²
49. f (x, y) = sin(x + y)

50. f (x, y) = cos(xy)
51. f (x, y) = y csc x

52. f (x, y) = y sec x

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