Найдите cos a, tg a, ctg a, если sin a = 0,6 и 7 < а < п(3 б)

cos(a) = sqrt(1 - sin^2(a)) = sqrt(1 - 0.6^2) = sqrt(0.76) = 0.87
tg(a) = sin(a) / cos(a) = 0.6 / 0.87 = 0.69
ctg(a) = 1 / tg(a) = 1 / 0.69 = 1.45