1.

If 7 theta = (2n +1) pi,where n = 0 , 1, 2, 3, 4,5, 6 then on the basis of above information, answer the following questions The value of sec pi//7 + sec 3pi//7 +sec 5pi//7 is

Answer»

-3
4
`-4`
3

Answer :A


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