a=2 b=1: sides tangent [True, True, True, True] ; A = -8*C*S ; A_M depends on x,y: False ; A*A_M == 128/25 identically in t,x,y: True
a=3 b=2: sides tangent [True, True, True, True] ; A = -24*C*S ; A_M depends on x,y: False ; A*A_M == 10368/169 identically in t,x,y: True
a=13/5 b=7/10: sides tangent [True, True, True, True] ; A = -182*C*S/25 ; A_M depends on x,y: False ; A*A_M == 548599688/328515625 identically in t,x,y: True
a=5 b=1: sides tangent [True, True, True, True] ; A = -20*C*S ; A_M depends on x,y: False ; A*A_M == 1250/169 identically in t,x,y: True
done
