Kąt \alpha jest kątem ostrym, a cos \alpha =\frac{1}{3} Oblicz wartość pozostałych funkcji trygonometrycznych kąta \alpha
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alfa(a) < 90 *
cos(a) = 1/3
sin^2(a) + cos^(a) = 1
sin^2(a) = 1-cos^2(a) = 1-(1/3)^2 = 1-1/9 = 9/9 - 1/9 = 8/9
sin(a) = V(8/9) = 2V2/3
tg(a) = sin(a)/cos(a) = 2V2/3 /1/3 = 2V2
tg(a) x ctg(a) = 1
ctg(a) = 1/tg(a) = 1/2V2 x V2/V2 = V2/4