Complete the Identity $$\frac { \sin x + \sin y } { \cos x + \cos y } = ?$$

question 154

Multiple Choice

Complete the identity.
- $$\frac { \sin x + \sin y } { \cos x + \cos y } = ?$$

• A) \(\tan \frac { x + y } { 2 }\)
• B) \(\tan x + \tan y\)
• C) \(\tan \frac { x - y } { 2 }\)
• D) \(\cot \frac { x - y } { 2 }\)

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