sina/1-cosa=ctg(a/2)
1+cosa/sina=1+cosa/sina=ctga
Отсюда ctg(a/2)=ctg(a/2)
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sina/1-cosa=ctg(a/2)
1+cosa/sina=1+cosa/sina=ctga
Отсюда ctg(a/2)=ctg(a/2)