,
, .
.
= | = = |
1. S . ( !) | 1. S. |
2. S | 2. S, ( ) |
3. . ( ) | 3. , , . |
:
S () , , ..
=0, 0,
. , ..
3.3 .
.
, , , .
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:
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: D ( )
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< 0, > -
> 0, < -
: , 90 , 90 , .
.
1 | S `= , ` .(, ) | ||
2 | S (; ); (; )= = | ||
3 | 0, 0, , | . S D ( ) ´ = | cos | ´ = | |
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