r2 r1 1+a t2-t1, t1 2 3 4 5 t2 t1*2, r t1 t2 r t2-t1, t 2/r 3, t1 t2 t1 : t2, t1/t2/t3, r 3/t 2, t2 t1 p2/p1, t 1-r 2, v1 / t1 v2 / t2, t1.2 f1.2, t1 + v1 t2 + v2, t1/t2 p1/p2, t 1/2*m*r 2, p1/t1 p2/t2, p2/p1 t2/t1, v1/v2 t1/t2, 1-t2/t1, p1 v1 /t1 p2 v2 /t2, r1/2 pt1/2
t1 2/t2 2 r1 3/r2 3. There are any references about t1 2/t2 2 r1 3/r2 3 in here. you can look below.