1) arctg(1) = π/42) arctg(-√3/3) = -π/63) 2arctg(-√3) + 3arctg(1) = 2 (-π/3) + 3 (π/4) = -2π/3 + 3π/4 = 5π/124) 1/2arctg(-1) + arcsin(1) - arccos(1) = 1/2 * (-π/4) + π/2 - 0 = -π/8 + π/2 = 3π/8
1) arctg(1) = π/4
2) arctg(-√3/3) = -π/6
3) 2arctg(-√3) + 3arctg(1) = 2 (-π/3) + 3 (π/4) = -2π/3 + 3π/4 = 5π/12
4) 1/2arctg(-1) + arcsin(1) - arccos(1) = 1/2 * (-π/4) + π/2 - 0 = -π/8 + π/2 = 3π/8