If `x , y , z` are in A.P., then `(sinx-sinz)/(cosz-cosx)` is equal to `tany` (b) `coty` (c) `siny` (d) `coty`

Explanation

To solve the problem, we need to show that if \( x, y, z \) are in Arithmetic Progression (A.P.), then

\[ \frac{\sin x - \sin z}{\cos z - \cos x} = \cot y. \]

### Step-by-Step Solution:

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