Arcsin(-1)+arccos1+arctg✓3/3+arcctg(-3)=-p/2+0+p/6+5p/6=-p/2+5p/6=p/3
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Arcsin(-1)+arccos1+arctg✓3/3+arcctg(-3)=-p/2+0+p/6+5p/6=-p/2+5p/6=p/3