a) tg(-π/3) = tan(-60°) = -√3
b) ctg(-π/6) = cot(-30°) = -√3/3
c) sin(405°) + cos(-45°) = sin(45°) + cos(45°) = √2/2 + √2/2 = √2
a) tg(-π/3) = tan(-60°) = -√3
b) ctg(-π/6) = cot(-30°) = -√3/3
c) sin(405°) + cos(-45°) = sin(45°) + cos(45°) = √2/2 + √2/2 = √2