arcsin(-a)=-arcsin(a)
arctg(-a)=-arctg(а)
arccos(-a)=Pi-arccos(a)
arcctg(-a)=Pi-arcctg(a)
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arcsin(-a)=-arcsin(a)
arctg(-a)=-arctg(а)
arccos(-a)=Pi-arccos(a)
arcctg(-a)=Pi-arcctg(a)