The 1.2 substituents in cyclohexane at position (a,a) or (e,e) give trans and (e,a) or (a,e) give cis.
Larger group try to prefer in equatorial position than axial position.
So tertiary butyl group must be in equatorial position and to get cis isomer methyl group must be in axial position.
a---> axial
e---> equatorial
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