1 1
a ~ 1
2 = EXP(a)

1 1
a ~ 1
a = COS(a)

2 2
a ~ 1
b ~ 0
a = COS(a)
b = TIMES(2, a)

2 2
a ~ 0
b ~ 1
a = TIMES(2, b)
b = COS(b)