Question

Визначте знак виразу: ctg 300⁰ sin 125⁰/cos 220⁰

Answer 1

ctg 300⁰ sin 125⁰/cos 220⁰=сtg(360°-60°)·sin(180°-55°)/cos(180°+20°)=
=-ctg60°·sin55°/(-cos20°)= ctg60°·sin55°/cos20°>0 +