Write the Word or Phrase That Best Completes Each Statement $$\tan \left( \frac { \pi } { 2 } + x \right) = - \cot x$$

Essay

Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
- $$\tan \left( \frac { \pi } { 2 } + x \right) = - \cot x$$