Wyrazenie sin do kwadratu alfa-1/sin alfa dla kata ostrego alfa jest rowne:
A. sin alfa-1
B. tg alfa cos alfa
C. -ctg alfa cos alfa
D. sin do kwadratu alfa - 1/sin alfa.
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(sin²α - 1)/sinα = (sin²α - sin²α - cos²α)/sinα = - cos²α/sinα = - ctgαcosα
odp C