Oblicz wartość pozostałych funkcji trygometrycznych kata ostrego alfa , gdy sni alfa = 12dzielone przez 13 Prosze Pomóżcie
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sina = 12/13
sin^2a + cos^2a = 1
(12/13)^2 + cos^2a = 1
cos2a = 1 - 144/169
cos2a = 25/169
cosa = 5/13
tga = sina /cosa = 12/13 : 5/13 = 12/13 * 13/5 = 12/5 = 2 i 2/5
ctga = 1 / tga = 1 : 12/5 = 1 * 5/12 = 5/12