Answer:
C. undefined
Explanation:
The cotangent function is defined as the ratio of the cosine and sine functions:
cot(x) = cos(x) / sin(x)
When x = π/2, sin(π/2) = 1 and cos(π/2) = 0, so we have:
cot(π/2) = cos(π/2) / sin(π/2) = 0/1
Division by zero is undefined in mathematics. Therefore, cot(π/2) is undefined.