Real functions, imaginary inputs

For some $x \in \mathbb{R}$ , which of the following are real functions?

1. $\sin{(ix)}$
2. $\cos{(ix)}$
3. $\tan{(ix)}$
4. $\sinh{(ix)}$
5. $\cosh{(ix)}$
6. $\tanh{(ix)}$
7. $\arcsin{(ix)}$
8. $\arccos{(ix)}$
9. $\arctan{(ix)}$

Concatenate the number(s) of the function(s) that are real functions in ascending order and submit that as your answer. For example, if functions 1 , 2 , 3 , 4 , and 5 are real functions, then your answer should be 12345 . If you think that none of these functions is a real function, input your answer as 0 .

Notation: $i = \sqrt{-1}$ denotes the imaginary unit.