In each of the Exercises 1 to 10 verify that the given functions (explicit or implicit) is a solution of the corresponding differential equation: 1. y = e x + 1 : y y = 0 2. y = x 2 + 2x + C : y 2x 2 = 0 3. y = cos x + C : y + sin x = 0 4. y = 2 1 x : y = 2 1 xy x 5. y = Ax : xy = y (x 0) 6. y = x sin x : xy = y + x 2 2 x y (x 0 and x > y or x < y) 7. xy = log y + C : y = 2 1 y xy (xy 1) 8. y cos y = x : (y sin y + cos y + x) y = y 9. x + y = tan1y : y 2 y + y 2 + 1 = 0 10. y = 2 2 a x x (a, a) : x + y dy dx = 0 (y 0) 11. The number of arbitrary constants in the general solution of a differential equation of fourth order are: (A) 0 (B) 2 (C) 3 (D) 4 12. The number of arbitrary constants in the particular solution of a differential equation of third order are: (A) 3 (B)
Question 1:y = e x + 1 : y – y✂ = 0
Question 2:y = x 2 + 2x + C : y✂ – 2x – 2 = 0
Question 3:y = cos x + C : y✂ + sin x = 0
Question 4:y = 2 1 x : y✂ = 2 1 xy x
Question 5:y = Ax : xy✂ = y (x 0)
Question 6:y = x sin x : xy✂ = y + x 2 2 x y (x 0 and x > y or x < – y)
Question 7:xy = log y + C : y✂ = 2 1 y xy (xy 1)
Question 8:y – cos y = x : (y sin y + cos y + x) y✂ = y
Question 9:x + y = tan–1y : y 2 y✂ + y 2 + 1 = 0
Question 10:y = 2 2 a x x (–a, a) : x + y dy dx = 0 (y 0)
Question 11:The number of arbitrary constants in the general solution of a differential equation of fourth order are: (A) 0 (B) 2 (C) 3 (D) 4
Question 12:The number of arbitrary constants in the particular solution of a differential equation of third order are: (A) 3 (B) 2 (C) 1 (D) 0