Answer
Option B is the answer.
negative pi/2 is not terminal to pi/2
Step-by-step explanation
The terminal approach to an angle refers to angles that are equivalent to a given angle, probably in other radiants.
So, we would check the options one by one to pick the angle that is not terminal to pi/2
Note that (pi/2) is in radians; in degrees, this is 90 degrees
(pi/2) = 90 degrees
Option A
90 degrees is terminal to (pi/2) as they are practically equal.
Option B
negative (pi/2) = -90°
In the 0° to 360° axis, the equivalent to -90° is 270°. Hence,
negative (pi/2) ≠ pi/2
Option C
-270° = 90° in the 0° to 360° axis
Option D
(5pi/2) = 450°
450° = 90° in the 0° to 360° axis.
Hope this Helps!!!