вычислите sin t и cos t, если t=0; 3 П/4; 7 П/6; - 2 П/3

1) t=0

sin 0=0

cos 0=1

2) t=3π/4

sin (3π/4) = sin (π-π/4) = sin π/4=√2/2

cos (3π/4) = cos (π-π/4) = - cosπ/4=-√2/2

3) t=7π/6

sin 7π/6=sin (π+π/6) = - sin π/6=-1/2=-0.5

cos 7π/6 = cos (π+π/6) = - cos π/6=-√3/2

4) t=-2π/3

sin (-2π/3) = - sin 2π/3=-√3/2

cos (-2π/3) = cos2π/3=-1/2=-0.5