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15.12:
a)
λ

λ
+
=

λ
t
T
x
π
A
T
t
x
π
A
2
cos
2
cos
(
29
,
2
cos
vt
x
A

λ
π
+
=
where
v
f
T
=
λ
=
λ
has been used.
b)
(
29
.
λ
2
sin
λ
2
vt
x
π
A
πv
t
y
v
y

=
∂
∂
=
c) The speed is the greatest when the cosine is 1, and that speed is
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