SSC CPO 2022 PYQ — Question 128

The correct answer is option 4 i.e. 0

Given that 

cos(-$7π\over 2$)

As we know that Cos (-A) = Cos A then,

= cos (7π/2) = cos (2π + (3π/2)) = cos 3π/2 = cos (π +π/2) = - cos π/2 = 0