SSC CGL 2021 PYQ — Question 52

The correct answer is option 4 i.e. -2

sin² 60° + cos² 30° - sin² 45° - 3sin²90°.

= $(\dfrac{\sqrt3}{2})^2+(\dfrac{\sqrt3}{2})^2-(\dfrac{1}{\sqrt2})^2-3\times1$

= 3/4 + 3/4 - 1/2 - 3

= 3/2 - 1/2 - 3

= 1 - 3

= -2