Question

qual a solucao da equacao 2cosx - raiz de 3 =0?
A +ou - pi/6 + 2pi k
B +ou- pi/4+2 pi k
C +ou- pi/2 + 2pi k
D +ou- pi/3 + 2pi k

Answer 1

Cosβ = β$+ 2k \pi$
2cosx=$\sqrt{3}$ ----> cosx= $\frac{ \sqrt{3} }{2} ---> \frac{ \pi }{6}$
Cosx= +\- $\frac{ \pi }{6} + 2k \pi$
Alternativa A