If a_(1), a_(2), a_(3).,,,,,,,,a_(n) are in A.P and their common diffe – InterviewSolution

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1.	If a_(1), a_(2), a_(3).,,,,,,,,a_(n) are in A.P and their common difference is d. The value of the series sin d_(1) [sec a_(1).sec a_(2) + sec a_(2).sec a_(3)+ ….+ sec a_(n-1).sec a_(n)] is……..
Answer» `sec a_(1).sec a_(N)` `COSEC a_(1)- cosec a_(n)` `cot a_(1)- cot a_(n)` `tan a_(n)- tan a_(1)` ANSWER :D

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