Question

Sabendo que Alfa= pi/2, calcule.

Answer 1

Resposta:

Olá bom dia!

α = π/2

α/2 = (π/2) / 2 = π/4

2α = 2(π/2) = π

3α = 3π/4

sen π/4 = sen 45° = √2 / 2

sen π = sen 90° = 1

sen 3π/4 = sen 135° = -√2/2

Logo:

A = (√2 / 2) - 3(1) + (-√2/2)/4

A = 4(√2 / 2) - 12 + 4(-√2/2)/4

A = 2√2 - 12 -√2/2)

A = -12