Предмет: Алгебра, автор: pollyz

1) cos a=0.28 и a-угол 1 четверти. Найти cos a/2

2)1-4 sin^ 2 a cos^ a /2 cos^ 2 a-1= ...                  

3)tg 2a tg a/(tg 2a- tg a)= sin 2a доказать тождество

4)2 tg a/ 1-tg^ 2 *(1 + cos 4 a)=...                a-альфа

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Автор ответа: Гоша68
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