1.Вычислите a)sin530-cos 22p/9

Question

1.Вычислите
a)sin530-cos 22p/9

Answer 1

Sin530°-cos22π/9=sin(360°+170°)-cos(2π+4π/9)=sin170°-cos4π/9=
=sin10°-cos80°=sin10°-sin10°=0