Question

resolver:

cos^{2} x + sen x + 1 = 0

Answer 1

$cos^{2} x + sen x + 1 = 0 \\ 1-sen^2x+senx+1=0 \\ sen^2x-senx-2=0 \\ \boxed{y=senx} \\ y^2-y-2=0 \\ y_1=-1 \\ y_2=2 \ (descartar) \\ senx=-1 \rightarrow \boxed{x=\frac{3\pi}{2}+2k\pi \ \ k \in N}$