If \( \alpha+\gamma=2 \beta \) then the expression \( \frac{\sin \a...

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If \( \alpha+\gamma=2 \beta \) then the expression \( \frac{\sin \alpha-\sin \gamma}{\cos \gamma-\cos \alpha} \) simplifies
P to:

V)
(a) \( \tan \beta \)
(b) \( -\tan \beta \)
(c) \( \cot \beta \)
(d) \( -\cot \beta \)
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