1. :
1) - (cos 
);
2) - (sin );
3) - (tg );
4) - (ctg );
5) , ;
6) , ;
7) , ;
8) , ;
9) , ;
10) , ࠠ ;
| cos =  =  ; = cos ; =  ;
sin =  =  ; CB=AB sin ; AB=  ;
tg =  =  ; CB=AC tg ; AC=  ;
ctg =  ; AC=CB ctg ; CB=  .
|
2. ϳ. .
| :  ( = 90  ).
:  = + .
|
:
1. , 
( =90 ), ( = 90 ).
2. : cos = , : cos = 
.
= 
= 
.
3. : cos 
= , : cos = 
.
= = .
4. + = + = ( + ) = = ;
= + .
3. . 3, 4, 5 , .
4. . , .
.
| , , , .
 = , = .
³ :
1. =
2. =
3. =
|
, .
3 :
1. ( =90 ), ( =90 ). + =90 + =90 ( ).
2. =90 - =
3. tg = 
=tg = 
, , = .
6.
|  , , , .
, , . г .
|
7. . - .
|
|
|
8. . sin tg , cos - .
9. . , .
