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Cis is the same side, and trans is opposite sides. You have to look at the two highest priority groups. So for example, if you are looking at a double bond and the two highest priority groups (most complex molecules) are on the same side (both up) or both down, then it is Cis. Trans is across from eachother.
Just to add on, you also want to look at if the two priority groups on the cyclohexane are axial or equatorial. If they are both axial up or both axial down /both equatorial up or both equatorial down, it will be Cis. If one priority group is axial up and the other is axial down then it is considered trans.
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