Question

ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

1)  сos127°= сos(180°-53°)=-cos53°=-sin37°

2) tg172°=tg(180°-8°)=-tg8°

3)sin219°=sin(270°-51°)=-cos51°=-sin29°

4) ctg194°=ctg(180°+14°)=ctg14°

5) cos400°=

6) tg(-298°)=-tg298°=-tg(270°+28°)=ctg28°

7) cos1.2π=cos(π+0.2π)=-cos0.2π

8) sin5π/9=sin(π-4π/9)=sin(4π/9)=sin(π/2-π/18)=cosπ/18

9)sin1916°=sin(360°*5+116°)=sin(116°)=sin(180°-64°)=sin(64°)=cos16°

10)cos3000°=cos(360*8+120°)=cos120°=cos(90°+30°)=-sin30°

11) tg4.3π=tg(4π+0.3π)=tg(0.3π)=tg(π/2-π/5)=ctgπ/5

12) ctg21π/8=ctg(2π+5π/8)=ctg5π/8=ctg(π-3π/8)=-ctg(3π/8)=-ctg(π/2-π/8)=

-tgπ/8