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If $A+C=2B$ then $\large\frac{\cos C- \cos A}{\sin A- \sin C}$ is equal to :

$\begin {array} {1 1} (a)\;\cot B & \quad (b)\;\cot 2B \\ (c)\;\tan 2B & \quad (d)\;\tan B \end {array}$

Can you answer this question?

$(d) \tan B$
answered Feb 27, 2014 by