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Mathematics
Mathematics
Problem
Explain why the function
y
=
cos
x
y = \cos x
y
=
cos
x
attains its maximum value at every point
x
=
2
n
π
x = 2n\pi
x
=
2
nπ
, where
n
∈
Z
n \in \mathbb{Z}
n
∈
Z
.
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