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
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.
You can use