Example 7: Find the solution of y + 2ý + 4y =x cos 3x The chr. Eq. is r? + 2r + 4 = 0 -bt vb2 - 4ac 2a yc = c,e* cos v3x + cze" sin v3x yp = (Ax + B)cos 3x + (Cx + D) sin 3x) yp = (A)cos3x + (Ax + B)(-3sin3x) + (C)(sin 3x)+(Cx+D)(3cos3x) ỹp = -3Asin 3x + (A)(-3sin3x) + (Ax + B)(-9 cos 3x) + 3C cos3x + C(3 cos 3x) + (CX + D)(-9 sin 3x) 5 sin 3x 61 54 sin3x + 3721 382 cos3x 3721 yp = 61 Cos 3x +

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Chapter1: Functions And Models
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Please explain how we got number 6/61 in example one and example two _1/36 ......... thank you very much
Example 7: Find the solution of i + 2ý + 4y = x cos 3x
The chr. Eq. is r2 + 2r + 4 = 0
-b+ vb? - 4ac
r1,2=
2a
12- -1+ iv3
yc = c,e* cos v3x + cze sin v3x
yp = (Ax + B)cos 3x + (Cx + D) sin 3x)
yp = (A)cos3x + (Ax + B)(-3sin3x) + (C)(sin 3x)+(Cx+D)(3cos3x)
ўр ——ЗAsin 3х + (A)(-3sin3х) + (Ах
+ B)(-9 cos 3x) + 3C cos3x
+ C(3 cos 3x) + (CX + D)(-9 sin 3x)
6
54
-sin3x +
3721
382
yp =
sin 3x
- cos 3x +
3721 Cos3x
61
Example 8: Find the solution of i - 4ý – 12y = xe4x
Sol:
The chr. Eq. is r2 – 4r – 12 = 0
(r - 6)(r + 2) = 0 -r, = 6,r, = -2
y = c,e"* + c,e"*
yc = c,e6x + cze-2
yp = (Ax + B)e 4x
ýp = Ae ** + 4(Ax + B)e1*
ÿp = 4Ae* + 4Ae* + 16(Ax + B)e**
-12A-1, A-1/10 , Jalauxe+*
4A-12B=0, Joles e 4x B=-1/36
ур
36e(3x + 1)
Transcribed Image Text:Example 7: Find the solution of i + 2ý + 4y = x cos 3x The chr. Eq. is r2 + 2r + 4 = 0 -b+ vb? - 4ac r1,2= 2a 12- -1+ iv3 yc = c,e* cos v3x + cze sin v3x yp = (Ax + B)cos 3x + (Cx + D) sin 3x) yp = (A)cos3x + (Ax + B)(-3sin3x) + (C)(sin 3x)+(Cx+D)(3cos3x) ўр ——ЗAsin 3х + (A)(-3sin3х) + (Ах + B)(-9 cos 3x) + 3C cos3x + C(3 cos 3x) + (CX + D)(-9 sin 3x) 6 54 -sin3x + 3721 382 yp = sin 3x - cos 3x + 3721 Cos3x 61 Example 8: Find the solution of i - 4ý – 12y = xe4x Sol: The chr. Eq. is r2 – 4r – 12 = 0 (r - 6)(r + 2) = 0 -r, = 6,r, = -2 y = c,e"* + c,e"* yc = c,e6x + cze-2 yp = (Ax + B)e 4x ýp = Ae ** + 4(Ax + B)e1* ÿp = 4Ae* + 4Ae* + 16(Ax + B)e** -12A-1, A-1/10 , Jalauxe+* 4A-12B=0, Joles e 4x B=-1/36 ур 36e(3x + 1)
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