10. If an, az, az, .... An are in A.P. with common difference d, then the sum of the series sin d
[cosec a, cosec a2 + cosec a2 cosec a3 + ... + cosec an - 1 cosec an ) is
(a) sec a1 - sec an
(b) cosec dj - cosec An
(c) cot aq - cot an
(d) tan a1 - tan an
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Option - (C)
In the place of a I have considered as "alpha"
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