Answer : The 3 carbons which are bonded to [tex]CH_{3}[/tex] have equally stable staaggered conformers.
There are 3 identical atoms of hydrogens in 2-methylhexane molecule (refer attached figure)
Therefore any degree of rotation of 60 or 180 or 300 in C-C bond will give a stable conformer of the same energy.
The image is attached for the stable staggered conformation.
