Question

Wyznacz zbiory: AuB, AnB i A\B

a) A= (-∞; sin 150°>, B= (cos(-90°); tg 240°),

Answer 1

Sin150°=sin(180°-30°)=sin30°=1/2
cos(-90°)=cos90°=0
tg240°=tg(180°+60°)=tg60°=√3
A=(-∞, 1/2)  
B=(0, √3)
AuB=(-∞, √3)
AnB=(0, 1/2)
A\B=(-∞,0>