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Thomas Calculus 13th [Solutions]

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∞ ∞ ∞<br />

ww w <br />

17. y xy 3y œ 0 Ê n 2<br />

n n 1 c x x n 1<br />

<br />

n c x 3<br />

n<br />

c x œ 0<br />

n n n<br />

nœ2 nœ1 nœ0<br />

∞ ∞ ∞<br />

n2 nn 1c x n<br />

nc x n<br />

n n 3cnx 0<br />

nœ2 nœ1 nœ0<br />

Ê œ<br />

power of x coefficient equation<br />

0<br />

3<br />

x 21c 2 3c0 œ 0 Ê c2 œ 2c0<br />

1<br />

1<br />

x 32c 3 1c 1 3c1 œ 0 Ê c3 œ 3c1<br />

2<br />

1 1<br />

x 43c 4 2c 2 3c2 œ 0 Ê c4 œ 12c2 œ<br />

8c0<br />

3<br />

x<br />

54c 5 3c3 3c3 œ 0 Ê c5<br />

œ 0<br />

4<br />

1 1<br />

x 65c 6 4c 4 3c4 œ 0 Ê c6 œ<br />

30c4 œ<br />

240c0<br />

ã ã ã<br />

n<br />

n3<br />

x n 2n 1c n c 3c œ 0 Ê c œ c<br />

n2 n n n2 n2n1<br />

n<br />

Section 17.5 Power-Series Soutions 1029<br />

3 2 1 3 1 4 1 6<br />

yœ c cx cx cx cx cx á œ cˆ 3 2 1 4 1 6 1<br />

1 x x x በcˆ 3<br />

x<br />

x‰<br />

0 1 2 0 6 1 8 0 240 0 0 2 8 240 1 3<br />

∞ ∞ ∞<br />

# ww w # <br />

18. x y 4xy 6y œ 0 Ê x n 2<br />

n n 1 c x 4x n 1<br />

<br />

n c x 6<br />

n<br />

c x œ 0<br />

n n n<br />

nœ2 nœ1 nœ0<br />

∞ ∞ ∞<br />

n<br />

nn 1c x n<br />

4nc x n<br />

n n 6cnx 0<br />

nœ2 nœ1 nœ0<br />

Ê œ<br />

power of x coefficient equation<br />

0<br />

x 6c0 œ 0 Ê c0<br />

œ 0<br />

1<br />

x 41c 1 6c1 œ 0 Ê c1<br />

œ 0<br />

2<br />

x 21c 242c 2 6c2<br />

œ 0 Ê 0œ<br />

0<br />

3<br />

x 32c 343c 3 6c3<br />

œ 0 Ê 0œ<br />

0<br />

4<br />

x 43c 444c<br />

4 6c 4 œ 0 Ê c 4 œ 0<br />

ã ã ã<br />

n<br />

x nn 1c 4n c 6c œ 0 Ê c œ 0<br />

2 2 3<br />

3<br />

y œ c x c x<br />

n n n n<br />

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