1.

If a_(1), a_(2), ……., a_(n) are in A.P. with common differece d != 0, then (sin d) [sec a_(1) sec a_(2) + sec a_(2) sec a_(3) + .... + sec a_(n - 1) sec a_(n)] is equal to

Answer»

a. `COT a_(n) - cot a_(1)`
B. `cot a_(1) - cot a_(n)`
C. `TAN a_(n) - tan a_(1)`
d. `tan a_(n) - tan a_(n - 1)`

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