funkcje trygonometryczne na teraz !!
zapisz wyrazenie w prostszej postaci
1/sina2 * (1- cosa2)
1 1
--------- * (1 - cos²α) = --------------- * (1 - cos²α) = 1
sin²α 1 - cos²α
sin²α + cos²α = 1
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1 1
--------- * (1 - cos²α) = --------------- * (1 - cos²α) = 1
sin²α 1 - cos²α
sin²α + cos²α = 1