Ответ:

Таким чином, sina = -0.6, cosa = -0.8, tg a = 0.75, ctg a ≈ 1.33.

Пошаговое объяснение:

cos(a) = -sqrt(1 - sin^2(a)) = -sqrt(1 - (-0.6)^2) ≈ -0.8

tan(a) = sin(a) / cos(a) = (-0.6) / (-0.8) = 0.75

ctg(a) = 1 / tan(a) = 1 / 0.75 ≈ 1.33