Question

No intervalo [0, 2π] a equação cos x = 1/2:

Answer 1

O cosseno é positvo nos quadrantes 1 e 4.

$\mathsf{cos(x)=\dfrac{1}{2}}\\\mathsf{x=\dfrac{\pi}{3}}\\\mathsf{x=2\pi-\dfrac{\pi}{3}=\dfrac{5\pi}{3}}$

$\boxed{\boxed{\boxed{\mathsf{s=\{\dfrac{\pi} {3},\dfrac{5\pi}{3}\}}}}}$