Question

cos480?con resolución

Answer 1

Cos(480°) = Cos(360° + 120°)

⇒ Cos(480°) = Cos(120°)

Cos(480°) = Cos(60°×2)

Cos(480°) = Cos²(60°) - Sen²(60°)

Cos(480°) = ($\frac{\sqrt{3} }{2}$)²+($\frac{1}{2}$)²

Cos(480°) = $\frac{3}{4}$ - $\frac{1}{4}$

Cos(480°) = -$\frac{1}{2}$