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Trigonometry
hard
0:00.0
The value of
c
o
s
(
n
p
i
)
\\cos(n\\pi)
cos
(
n
p
i
)
for any integer
n
n
n
is:
A
1
B
(
−
1
)
n
(-1)^n
(
−
1
)
n
C
0
D
−
1
-1
−
1
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