Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

\(\frac{{sin\;A\; + \;sin\;B}}{{cos\;A - \cos B}} + \frac{{\cos A\; + \;\cos B}}{{sin\;A - sin\;B}} = \;?\)

1
sin A cos B
2
tan A tan B
3
0
4
cos A cos B

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