Solving for real values while function values are complex

[hongyizhao]

I noticed the following description in the document of Solve:

Solve[expr&&vars[Element]Reals,vars,Complexes] solves for real values
of variables, but function values are allowed to be complex.

Are there any specific examples that may be helpful to understand this usage?

Regards,
Zhao

[hansmilton]

Here is an example:

Same as giving Reals as the third argument: