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x   (t )  x 3 (t ) u (t ),

12) y (t )  2 x 2 (t )  x (t ) u (t ).


) 1 ( x  ; 1 u (t )  t 2


x   u (t / ) x (t ),
.
13)  y (t )  sin(x (t )) cos(u (t ))

) 0 ( x  ; 0 u (t )  . t

x  (t )  (x 2 (t )  ) 1 e u (t ) .

14)  y (t )  u (t ) x (t ).

u (t )  , t ) 0 ( x  . 1

2
x  (t )  [x (t )t ]  u 2 (t ),

15) 2 2
 y (t )  x (t / ) u (t ).
u (t )  ; t ) 0 ( x  . 0

x  (t )  e  x (t ) u (t ),

16) y (t )  e x (t )  ln(u (t )).


u (t )  2 ; t ) 0 ( x  . 0

x  (t )  u (t / ) x (t ),


17) y (t )  e x (t ) u 2 (t ).

u (t )  ; t ) 0 ( x  . 0


x   u (t / ) x 4 (t ),
18)  y (t )  sin(x (t )) sin(u (t )) .

) 0 ( x  ; 0 u (t )  . t

x  (t )  e x (t ) u 2 (t ),

19) 4
 y (t )  x (t ) ln(u (t )).

u (t )  2 ; t ) 0 ( x  . 0

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