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Mathematics
Mathematics
Problem
How many real numbers
x
x
x
in the interval
(
0
,
3
π
)
(0,3\pi)
(
0
,
3
π
)
satisfy
cos
x
=
0
\cos x = 0
cos
x
=
0
? a)
4
4
4
b)
5
5
5
c)
3
3
3
d)
2
2
2
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