The compound has a branched structure with the central carbon atom being tertiary (\(3\degree\)). The carbons attached to it are primary (\(1\degree\)) and secondary (\(2\degree\)). Only one carbon atom in this molecule is secondary (attached to two other carbons).
The portion of the line \( 4x + 5y = 20 \) in the first quadrant is trisected by the lines \( L_1 \) and \( L_2 \) passing through the origin. The tangent of an angle between the lines \( L_1 \) and \( L_2 \) is: