SOLUTION: Complete the identity: sin x + sin y / cos x + cos y

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Question 1072675: Complete the identity:
sin x + sin y / cos x + cos y
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Complete the identity:
sin x + sin y / cos x + cos y
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Not clear, add parentheses.
What identity?