2
2
2
cos
0
d y
dy
dx
dx
⎛
⎞
⎛
⎞
+
=
⎜
⎟
⎜
⎟
⎝
⎠
⎝
⎠
5 2
2
cos3
sin3
d y
x
x
dx
=
+
6 2
(
y′′′)
 + (y″)3 + (y′)4 + y5 = 0
7 y′′′ + 2y″ + y′ = 0
© NCERT
not to be republished
DIFFERENTIAL EQUATIONS
383
8