, 2- ( =2), ( = 2), = +2 = 2 +2 - 2 = 2 . : t, , . , , . :
1) = f(x) t = const;
2) t = f(x, y ) P = const
3) y = f(x) P = const, t = const.
( , x )
. ; ; .
. .
; ; , , , .
t = f(x,y) P = const
. t , ; tA tB . 1*, 2*, 3* .. * = * /. t 1, 2, 12 .
.
y = f(x) (. ) P = const . = const , : x, y,* t. .
.
, ( ).
txy , .
() . . γ. . . ( ) .