What are two conformations of cis-1,4-dimethyl cyclohexane?
There are one chair conformation and two boat conformations of cis-1,4-dimethylcyclohexane.
The chair form
The structure of cis-1,4-dimethylcyclohexane is
You can draw two "flipped" cyclohexane chairs.
The two conformations are identical.
There is only one chair conformation of cis-1,4-dimethylcyclohexane.
The boat forms
You can also draw two "flipped" boat conformations.
The two conformations are different, but the one on the right is more stable.