帮忙求下这2个角度是多少?∠arctan(-2/-2√3)和∠arctan(-2/2√3)

Question

帮忙求下这2个角度是多少?∠arctan(-2/-2√3)和∠arctan(-2/2√3)

Answer 1

arctan(-2/-2√3)
=arctan(√3/3)
=π/6
arctan(-2/2√3)
=arctan(-√3/3)
=-π/6