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If a(1), a(2), a(3)…..a(n) are in A.P. w...

If `a_(1), a_(2), a_(3)…..a_(n)` are in A.P. with common difference d then sin d `[cosec a_(1) cosec a_(2) + cosec a_(2) cosec a_(3) + cosec a_(3) cosec a_(4)+ …"n terms"]`=

A

`cot a_(1)- cot a_(n+1)`

B

`tan a_(1)- tan a_(n+1)`

C

`sec a_(1)- sec a_(n+1)`

D

`cosec a_(1)- cosec a_(n+1)`

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A
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