Question

arcos1=
arccos $frac{ sqrt{3} }{2}$ =
arccsin(-1)=
arctg(-1)=
arccos (-$frac{1}{2}$)=
arctg 1=

Answer 1

1) 0
2) $30^0$
3)$-45^0$
4)$-45^0$
5)$120^0$
6)$45^0$