Question

cos² theta -1/4=1/2​

Answer 1

➼ Answer ➼

$cos^{2}\theta-\frac{1}{4} =\frac{1}{2}$

$=>cos^{2}\theta=\frac{1}{2} +\frac{1}{4}$

$=>cos^{2}\theta=\frac{2}{4} +\frac{1}{4}$

$=>cos^{2}\theta=\frac{3}{4}$

$=>cos\theta=\frac{\sqrt{3} }{\sqrt{4} }$

$=>cos\theta=\frac{\sqrt{3} }{2}$

$=>\theta=60$°

Hence, the value of $\theta$ is $60$°

☆ Hope it Helps ☆