Gauche-butane interaction in cis- and trans-methyldecalins

One of the conformations in Newman projection where the dihedral angle between the two methyl groups is 60 degrees is called Gauche conformation. There is still a repulsive interaction between the two methyl groups that increases the energy called Gauche butane interaction. In P there are 5 Gauche-butane interactions and in Q there are 4.

[Cristianosiuuu]

perfectly described, got everything crystal clearly!

[Abhi-phks]

Short, simple, straight to the point.

[arvivaradan]

Sir discribe the interactions using newmann form I can't get it clearly