1)a) Cos(11π/3) = Cos(π + 2π + 4π + (π/3)) = Cos(π/3) = 1/2b) Sin(11π/3) = Sin(π + 2π + 4π + (π/3)) = Sin(π/3) = √3/2c) Tan(11π/3) = Sin(11π/3)/Cos(11π/3) = (√3/2) / (1/2) = √3d) Cot(11π/3) = 1/Tan(11π/3) = 1/√3 = √3/3
2)a) Ctg(11π/3) = 1/Tan(11π/3) = 1/(√3) = √3/3
1)
a) Cos(11π/3) = Cos(π + 2π + 4π + (π/3)) = Cos(π/3) = 1/2
b) Sin(11π/3) = Sin(π + 2π + 4π + (π/3)) = Sin(π/3) = √3/2
c) Tan(11π/3) = Sin(11π/3)/Cos(11π/3) = (√3/2) / (1/2) = √3
d) Cot(11π/3) = 1/Tan(11π/3) = 1/√3 = √3/3
2)
a) Ctg(11π/3) = 1/Tan(11π/3) = 1/(√3) = √3/3