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If alpha , beta , gamma in [0,pi] an...

If ` alpha , beta , gamma in [0,pi] and `if ` alpha , beta , gamma ` are in A.P then ` ( sin alpha - sin gamma)/( cos gamma -cos alpha)` is equal to

A

`sin beta `

B

`cos beta `

C

`cot beta `

D

`2 cos beta `

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The correct Answer is:
C
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