\begin{array} { r } { \text { Example } 13 \text { Prove that } } \\ { – InterviewSolution

1.	\begin{array} { r } { \text { Example } 13 \text { Prove that } } \\ { \frac { \sin ( x + y ) } { \sin ( x - y ) } = \frac { \tan x + \tan y } { \tan x - \tan y } } \end{array}
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