Question

resolva a equação 2 cos (x) -1 = 0 com x € [0,2pi]​

Answer 1

$\mathsf{2cos(x)-1=0}\\\mathsf{2cos(x)=1}\\\mathsf{cos(x)=\dfrac{1}{2}}$

$\mathsf{x=\dfrac{\pi}{3}~ou~x=\dfrac{5\pi}{3}}$

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