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42. Repeating the steps of Eq. 1734
−→
Eq. 1740, but applying
cos
α
+cos
β
=2cos
µ
α
+
β
2
¶
cos
µ
α
−
β
2
¶
(see Appendix E) instead of Eq. 1737, we obtain
y
0
=[0
.
10 cos
πx
]cos4
πt
with SI units understood.
(a) For nonnegative
x
, the smallest value to produce cos
πx
=0is
x
=1
/
2, so the answer is
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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