SSC CPO 2022 PYQ — Question 131

The correct answer is option 3 i.e. $\frac{3}{2}$ 

The trigonometric equation given to us is:-

⇒ cos²45° + cos² 1350+ cos²225° + cos²315°

⇒ cos²45° + cos²(3× 360 + 270) + cos²(180 + 45) + cos²(360 - 45)

⇒ $1\over 2$ + 0 + $1\over 2$ + $1\over 2$

⇒ $3\over 2$