# $\cos x = \cosh x?$

Geometry Level 1

Billy Tangent naively thought that the hyperbolic cosine function and the standard cosine function were the same. To make sure, he tried one real value and, sure enough, he got the same result.

What value did he try?

If you think there are multiple values for which this would work, enter 99999 as your answer.
If you think there are no values for which this would work, enter 88888 as your answer.

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