Вычислите : 1)2arcsin (-√3/2) + arctg(-1) + arccos√2/2 - arcctg1; 2) arccos(-1) - arcsin0 + arcctg (-√3) + arctg 1/√3

1)2arcsin (-√3/2) + arctg(-1) + arccos√2/2 - arcctg1= 2*(-π/3) -π/4 + π/4 -π/4 = 
= -2π/3 -π/4 = -11π/12
2) arccos(-1) - arcsin0 + arcctg (-√3) + arctg 1/√3 =π - 0 - π/6 + π/6 = π