I want Mathematica to simplify
Cosh[I x] to
Cos[x] if I tell Mathematica that
x is Real.
I have tried everything, but it ends up giving
Cosh[I x] back.
closed as too localized by Artes, Silvia, Michael E2, m_goldberg, Oleksandr R. Jun 25 '13 at 17:51
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