Question

arccos (-$sqrt{}frac{2}{2}$ ) - arcsin(-1) = 

Answer 1

arccos (- ) - arcsin(-1) = 3П/4+П/2=5П/4

Answer 2

$arccos(- frac{ sqrt{2} }{2} )-argsin(-1)= frac{3 pi }{4} + frac{ pi }{2} = frac{5 pi }{4}$