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Problem
Problem
The number of the solution of the equation
cos
(
π
x
−
4
)
⋅
cos
π
x
=
1
\cos(\pi\sqrt{x-4}) \cdot \cos \pi\sqrt{x} = 1
cos
(
π
x
−
4
)
⋅
cos
π
x
=
1
is a.
>
2
>2
>
2
b. 2 c. 1 d. 0
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