If 
then write the value of 
in the simplest form.
Given, 
To find the value of 
[using the formula cos 2x = 2cos2 x – 1]
[using the formula cos 2x = 2cos2 x –1, here 2x = θ so x = 
]
As given, 
now by dividing the whole inequation with 2 we get, 
.
This clearly state that 
lies in the 1st quadrant and between 45° and 90°.
So 
1