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При возрастании острого угла \(\sin \alpha\) и \(\tg \alpha\) возрастают, а \(\cos \alpha\) и \(\ctg \alpha\) убывают.

Если \(\alpha\_1\gt \alpha\_2\) , то \(\sin \alpha\_1\gt \sin \alpha\_2\) , \(\tg \alpha\_1\gt \tg \alpha\_2\) , \(\cos \alpha\_1\lt \cos \alpha\_2\) , \(\ctg \alpha\_1 \lt \ctg \alpha\_2\) .

Cравни значения:

1. \(\sin 15\degree\) [ ] \(\sin 45\degree\) ;

2. \(\tg 26\degree\) [ ] \(\tg 71\degree\) ;

3. \(\cos 18\degree\) [ ] \(\cos 63\degree\) ;

4. \(\ctg39\degree\) [ ] \(\ctg 67\degree\) ;

5. \(\sin 79\degree\) [ ] \(\tg 54\degree\) ;

6. \(\cos 31\degree\) [ ] \(\ctg 67\degree\) .