3. Oblicz cos alfa jeżeli alfa jest kątem ostrym i tg alfa = 3.
tg alfa = sin alfa / cos alfa
3 = sin alfa/ cos alfa |*cos alfa
3cos alfa = sin alfa |/3
cos alfa= sin alfa/3
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tg alfa = sin alfa / cos alfa
3 = sin alfa/ cos alfa |*cos alfa
3cos alfa = sin alfa |/3
cos alfa= sin alfa/3