1. Obtain the General Solution (1-5). 1. (1 — х)у %3D у?. 2. sin x sin y dx + cos x cos y dy = 0. 3. xy dx + e** dy = 0. 4. 2y dx = 3x dy. 5. my dx = nx dy. %3D %3D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Differential equation

Activity 3: Variable Separable
I.
Obtain the General Solution (1-5).
1. (1 — х)у' %3D у?.
2. sin x sin y dx + cos x cos y dy = 0.
3. ху3 dх + e** dy %3D 0.
4. 2y dx = 3x dy.
5. тy dx — пх dy.
ANS. y In |c(1 – x)| = 1.
ANS. sin y = c cos x.
e-x2
+ y-2 = c.
ANS. x? 3D суз.
ANS. x" 3Dсу".
ANS.
II. Obtain the Particular Solution (6-10).
27. dr/dt = -4rt; when t = 0, r = ro.
28. 2xyy' = 1 + y²; when x = 2, y = 3.
29. хуу 3D 1 + у?; when x %3D2, у %3D 3.
30. 2y dx = 3x dy; when x = 2, y = 1.
r = ro exp (-2t²).
y = /5x – 1.
ANS. y = /10x² – 4.
y = (x/2)²/3.
ANS.
ANS.
ANS.
33. у 3 хехp (у — х?); when x — 0, у %3D 0.
y = In
ANS.
1+ exp(— х?)
Transcribed Image Text:Activity 3: Variable Separable I. Obtain the General Solution (1-5). 1. (1 — х)у' %3D у?. 2. sin x sin y dx + cos x cos y dy = 0. 3. ху3 dх + e** dy %3D 0. 4. 2y dx = 3x dy. 5. тy dx — пх dy. ANS. y In |c(1 – x)| = 1. ANS. sin y = c cos x. e-x2 + y-2 = c. ANS. x? 3D суз. ANS. x" 3Dсу". ANS. II. Obtain the Particular Solution (6-10). 27. dr/dt = -4rt; when t = 0, r = ro. 28. 2xyy' = 1 + y²; when x = 2, y = 3. 29. хуу 3D 1 + у?; when x %3D2, у %3D 3. 30. 2y dx = 3x dy; when x = 2, y = 1. r = ro exp (-2t²). y = /5x – 1. ANS. y = /10x² – 4. y = (x/2)²/3. ANS. ANS. ANS. 33. у 3 хехp (у — х?); when x — 0, у %3D 0. y = In ANS. 1+ exp(— х?)
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