(A)
2
2
0
d y
y
dx
+
=
(B)
2
2
0
d y
y
dx
−
=
(C)
2
2
1
0
d y
dx
+ =
(D)
2
2
1
0
d y
dx
− =
12 Which of the following differential equations has y = x as one of its particular
solution (A)
2
2
d y2
xdy
xy
x
dx
dx
−
+
=
(B)
2
d y2
xdy
xy
x
dx
dx
+
+
=
(C)
2
2
2
0
d y
xdy
xy
dx
dx
 
 
 
(D)
2
2
0
d y
xdy
xy
dx
dx
+
+
=
9 5