Trigonometria

Question 1

Cos (-x)= Cos x

Sen (-x)= -Sen x

Answer 1

….

Question 2

Adição de arcos

Answer 2

Sen(a+b)= Sena.cosb+senb.cosa

Cos(a+b)=cosa cosb - sena senb

Tg(a+b)= tga+tgb/1-tga.tgb

2senacosa
Cos2a-Sen2a
2tga/1-tg2a