Write the Word or Phrase That Best Completes Each Statement $$\frac { \cot ^ { 2 } x } { \csc x + 1 } = \frac { 1 - \sin x } { \sin x }$$

Essay

Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
- $$\frac { \cot ^ { 2 } x } { \csc x + 1 } = \frac { 1 - \sin x } { \sin x }$$