Приклад. 6
x t
dx dx 5 6 dtt 5 t 3 dt
1 1 dx 6 dtt 2 3 6
3
x x t t t 1
x 3 x 2 t x
6
t 3 1 1 t 1 tt 2 1 1
6 dt 6 dt
t 1 t 1
2
3
3
a b a b a ab b 2
t 3 1 t 1 tt 2 1