If 4Cos2Î¸=3 then Î¸=ââââ

If $4 C o s^{2} Î¸ = 3$ then $Î¸ = â â â â$

A
$\frac{Ï}{6}, \frac{5 Ï}{6}$
B
$\frac{Ï}{4}, \frac{3 Ï}{4}$
C
$\frac{Ï}{3}, \frac{2 Ï}{3}$
D
$Â\pm \frac{Ï}{2}$

Solution:

$4 \cos^{2} Î¸ = 3$

$â c o s^{2} Î¸ = {(\frac{\sqrt{3}}{2})}^{2} â Î¸ = n Ï Â\pm \frac{Ï}{6}$

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