Question

77) Observe o cielo trigonométrico abaixo:
O seno do arco
2pi/3 rad corresponde ao cosseno de
​

Answer 1

Sen(2π/3)=sen(π/3)=cos(π/6)

Sen(2π/3)=cos(π/6)=cos(2π-π/6)

sen(2π/3)=cos(11π/6)

Alternativa c