arccos(-1/2) - arcctg(-√3) = π - arccos(1/2) - (π - arcctg(√3)) =
= π - π/3 - (π - π/6) = 2π/3 - 5π/6 = - π/6
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arccos(-1/2) - arcctg(-√3) = π - arccos(1/2) - (π - arcctg(√3)) =
= π - π/3 - (π - π/6) = 2π/3 - 5π/6 = - π/6