Question

с помощью формул приведения вычислить tg 135 градусов . sin 150 градусов . cos 5п/3

Answer 1

tg135°=tg(3$\pi$/4);
sin150°=sin(5$\pi$/6);
tg(3$\pi$/4)·sin(5$\pi$/6)·cos(5$\pi$/3)=
-1·1/2·1/2=-1/4

Answer 2

tg135° = tg(180° +45°) = tg45° = 1
Cos5π/3 = Cos(2π - π/3) = Cosπ/3 = 1/2