Write the Word or Phrase That Best Completes Each Statement $$\frac { \cos ( x - y ) } { \cos ( x + y ) } = \frac { 1 + \tan x \tan y } { 1 - \tan x \tan y }$$

Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
- $$\frac { \cos ( x - y ) } { \cos ( x + y ) } = \frac { 1 + \tan x \tan y } { 1 - \tan x \tan y }$$

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\[\begin{array} { l }
\frac { \cos ( x ...

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