Question

cosx-4cosx+3=0.ajutatima varog

Answer 1

$cos x-4cos x+3=0$
$-3cosx+3=0$
$-3cos x=-3 /(*-1)$
$3cosx=3$
$cos x= \frac{3}{3}$
$cos x=1$

Answer 2

-3cos x =3
cos x=1
x=o sau adaugi + 2pi la 0 si ai mai multe valori pt ca e fct. periodica