Question

Utilizando as relações trigonométricas, calcule sen(11pi/6)

Answer 1

sen (a - b) = sen a × cos b - sen b × cos a

11π/6 = 2π - π/6

sen (2π - π/6) = sen 2π × cos π/6 - sen π/6 × cos 2π
sen (11π/6) = 0 - 0,5.1
sen (11π/6) = - 0,5