Спримером ! arcsin(sin(33п/7))+arccos(cos(46п/7))

Arcsin(sin(4π+5π/7))+arccos(cos(6π+4π/7))=
=arcsin(sin(5π/7))+arccos(cos(4π/7))=arcsin(sin(-3π/14))+arccos(cos(-π/14))=
=arcsin(-sin3π/14)+arccos(cosπ/14)=-arcsin(sin3π/14)+arccosπ/14=
=-3π/14+π/14=-2π/14=-π/7