X

0

1

1

Y

-1

-1

X

0

1

1

Y

-1

-1

X

0

1

1

Y

-1

-1

X

0

1

1

Y

-1

-1

g x

x +

( ) =

1

h x

x –

( ) =

1

f x

x

( ) =

g x

x

( ) = 2

h x

x

( ) =

f x

x

( ) =

g x

x

( ) = 2

f x

x

( ) =

1
2

_

h x

x

( ) =

1
2

_

_

2

2

2

2

2

2

2

2

2

f

1

g

1

h

1

f

3

g

3

h

3

f

2

g

2

h

2

f

4

g

4

h

4

4

4

4

1

1

2

g x

x +

( ) = –

1

h x

x –

( ) = –

1

f x

x

( ) = –

2

2

2

3

2

3

3

2

2

1

(c) by Wydawnictwa Szkolne i Pedagogiczne Spó³ka Akcyjna