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Problem
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
, the value of
c
cos
(
A
−
θ
)
+
a
cos
(
C
+
θ
)
c \cos(A - \theta) + a \cos(C + \theta)
c
cos
(
A
−
θ
)
+
a
cos
(
C
+
θ
)
cannot exceed
(
θ
∈
(
0
,
2
π
)
)
(\theta \in (0, 2\pi))
(
θ
∈
(
0
,
2
π
))
[Letters have usual meanings] a.
a
a
a
b.
b
b
b
c.
c
c
c
d.
s
s
s
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