А) = -Sin16π/3 = -Sin(5π + π/3) = Sin π/3 = √3/2
б) = 0
в) =Сos1140° = Cos(360°·3 + 60°) = Cos 60° = 1/2
г) =-Sin 840° - Sin(360°·2 + 120°) = -Sin120° = -√3/2
д) = tg(-71π/6) = -tg 71π/6 = -tg( 11π + 5π/6) = = -tg5π/6 =
= 1/√3
е) Ctg 945° = Ctg(360°·3 - 135°) = - Ctg135 = 1
ж) = Cos35π/3 = Сos( 12π - π/3) = Сos π/3 = 1/2