Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.
-$\tan 40 ^ { \circ } \cot 40 ^ { \circ }$
A) $- 1$
B) 40
C) 1
D) 0

Question

Quizplus · Accepted Answer

The product of $\tan \theta$ and $\cot \theta$ is always 1, because $\cot \theta = \frac{1}{\tan \theta}$, so their product is $\tan \theta \cdot \frac{1}{\tan \theta} = 1$.

Use the Properties of the Trigonometric Functions to Find the Exact