A Very Easy Way to Derive Fixed End Moments For Propped Cantilvers

In order to proceed with this problem, a zero length span is added to the left hand side

Applying the three moment theorem

M_A’ (0) + 2M_A (0+l) + M_B (l) =wl³/4

2M_A (l) = wl³/4

M_A = (wl²)/4

This is the fixed end moment M_A