1. , ,
;
.
2. , ,
.
3. A, .
11) ó. . , , , , 2 , .
:
, b 2 = c 2 a 2.
. . , -
, -
, .
2 = 2
, e = 1. , .
12 .
1. ; ,
2.
3 (). ( ), = ,
.
1. D(y).
2. D(y) .
3. ( )
13) . , .
.
, .
, , = f (t), ; t . -
t ( ).
t 0, 1. , t , . .
1. , = , = const, .