25. (y + √√x² + y²) dx − x dy = 0; when x = √√√3, y = 1. ANS. x² = 2y + 1.

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Author:James Stewart
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Chapter1: Functions And Models
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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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Topic: homogeneous DE, Please answer number 25
23. (x - y) dx + (3x + y) dy = 0; when x = 2, y = -1.
ANS. _2(x + 2y) + (x + y) ln (x + y) = 0.
ANS. x² = 9 6y.
ANS. x² = 2y + 1.
tan (y/x) = ln (e/x).
x - y = 5(y + 4x) ln x.
4(2y + x) ln y = 2y - - X.
ANS. y(3x² + 4y²) = 4.
29. xy dx + 2(x² + 2y²) dy = 0; when x = 0, y = 1.
30. y(2x² - xy + y²) dx − x²(2x − y) dy = 0; when x = 1, y = 1.
ANS. y2 In x = 2y² + xy − x².
31. y(9x2y) dx − x(6x − y) dy = 0; when x = 1, y = 1.
3x³x²y - 2y² = 0.
V
24. (y
25. (y +
/x² + y²) dx − x dy = 0; when x = √√3, y = 1.
/x² + y²) dx − x dy = 0; when x = √√√3, y = 1.
V
=
26. [x cos² (y/x) − y] dx + x dy = 0; when x
1, y = π/4.
27. (y² + 7xy + 16x²) dx + x² dy
=
0; when x =
= 1, y = 1.
ANS.
28. y² dx + (x² + 3xy + 4y²) dy = 0; when x = 2, y = 1.
ANS.
ANS.
ANS.
32. y(x² + y²) dx + x(3x² − 5y²) dy = 0; when x = 2, y = 1.
Transcribed Image Text:23. (x - y) dx + (3x + y) dy = 0; when x = 2, y = -1. ANS. _2(x + 2y) + (x + y) ln (x + y) = 0. ANS. x² = 9 6y. ANS. x² = 2y + 1. tan (y/x) = ln (e/x). x - y = 5(y + 4x) ln x. 4(2y + x) ln y = 2y - - X. ANS. y(3x² + 4y²) = 4. 29. xy dx + 2(x² + 2y²) dy = 0; when x = 0, y = 1. 30. y(2x² - xy + y²) dx − x²(2x − y) dy = 0; when x = 1, y = 1. ANS. y2 In x = 2y² + xy − x². 31. y(9x2y) dx − x(6x − y) dy = 0; when x = 1, y = 1. 3x³x²y - 2y² = 0. V 24. (y 25. (y + /x² + y²) dx − x dy = 0; when x = √√3, y = 1. /x² + y²) dx − x dy = 0; when x = √√√3, y = 1. V = 26. [x cos² (y/x) − y] dx + x dy = 0; when x 1, y = π/4. 27. (y² + 7xy + 16x²) dx + x² dy = 0; when x = = 1, y = 1. ANS. 28. y² dx + (x² + 3xy + 4y²) dy = 0; when x = 2, y = 1. ANS. ANS. ANS. 32. y(x² + y²) dx + x(3x² − 5y²) dy = 0; when x = 2, y = 1.
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