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Problem
Problem
If
0
≤
x
≤
3
π
0 \le x \le 3\pi
0
≤
x
≤
3
π
,
0
≤
y
≤
3
π
0 \le y \le 3\pi
0
≤
y
≤
3
π
and
cos
x
⋅
sin
y
=
1
\cos x \cdot \sin y = 1
cos
x
⋅
sin
y
=
1
, then find the possible number of values of the ordered pair
(
x
,
y
)
(x, y)
(
x
,
y
)
.
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