1) ctg π/6 = 1/√3, sin π/3 = √3/2, cos π/3 = 1/21/√3(√3/2 - 3(1/2)) = (1/√3)(√3/2 - 3/2) = (1/√3)(-2/2) = -2/3
2) cos π/4 = √2/2, ctg π/4 = 1, sin π/6 = 1/2√2/2(21 - 3(1/2)) = √2/2(2 - 3/2) = √2/2(4/2 - 3/2) = √2/2(1/2) = √2/4 = √2/4
1) ctg π/6 = 1/√3, sin π/3 = √3/2, cos π/3 = 1/2
1/√3(√3/2 - 3(1/2)) = (1/√3)(√3/2 - 3/2) = (1/√3)(-2/2) = -2/3
2) cos π/4 = √2/2, ctg π/4 = 1, sin π/6 = 1/2
√2/2(21 - 3(1/2)) = √2/2(2 - 3/2) = √2/2(4/2 - 3/2) = √2/2(1/2) = √2/4 = √2/4