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: Early Transcendentals
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Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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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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