Question

Resolva a equação em ℝ : cos + 1 =
2, ∈ [0, 2]
a) = {3/2; /2}
b) = {/2; ; 4/3}
c) = {/2, 3/2, }
d) = {/3, , 3/2}

Answer 1

$\mathsf{cos(x)+1=2}\\\mathsf{cos(x)=2-1}\\\mathsf{cos(x)=1}\\\mathsf{x=0~~x=2\pi}$