GIA'I PHU.O.NG TRNH TUY^EN TNH C^AP 2 VO.I H^E. S^O HANG SAU

158) - 201-bai-tap-phuong-trinh-vi-phan
201-bai-tap-phuong-trinh-vi-phan
158)

Gia'i phu.o.ng trnh tuy^en tnh c^ap 2 vo.i h^e. s^o hang sau:

y”−3y

0

+ 2y= 2 cosxHD gia’i:

D - ^ay la phu.o.ng trnh tuy^en tnh c^ap 2 kh^ong thu^an nh^at vo.i h^e. s^o hang.

Nghi^e.m t^o'ng quat la:

y=C

1

e

x

+C

2

e

2x

+15cosx− 35sinx.