## Trigonometry (10th Edition)

1. If cotangent is undefined, it means that it has a value of zero in its denominator $\cot\theta=\frac{a}{0}=undefined$ 2. Since tangent is the reciprocal of cotangent, when cotangent is undefined the tangent is zero, independent from a. $\tan\theta=\frac{0}{a}=0$