If n is an integer, n ∙ 180° represents an integer multiple of 180°, and (2n + 1) ∙ 90° represents an odd integer multiple of
90°. Decide whether the expression is equal to 0, 1, -1, or is undefined.
-$\cot \left( \mathrm { n } \cdot 180 ^ { \circ } \right)$
A) $- 1$
B) 1
C) Undefined
D) 0

Question

Quizplus · Accepted Answer

The cotangent of an integer multiple of 180° is undefined because the tangent of these angles is 0, and cotangent is the reciprocal of tangent.

If N Is an Integer, N ∙ 180° Represents an Integer