Question

Calcular o valor da expressão:

E= cos13π + sen(34π/3)/sen(39π/2)​

Answer 1

cos (13π) = cos (12π + π) = cos (π) = -1

sen (34π/3) = sen (36π/3 - 2π/3) = sen (12π - 2π/3) = sen (-2π/3) = -√3/2

sen (39π/2) = sen (36π/2 + 3π/2) = sen (18π + 3π/2) = sen (3π/2) = -1

E = (-1 -√3/2) / (-1)

E = 1 + √3/2