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 equation whose roots are cos pi//7 , cos 3pi//7, cos 5pi//7 is

Answer»

`8x^(3) + 4X^(2) + 4x + 1 = 0`
`8x^(3) - 4x^(2) - 4x + 1 = 0`
`8x^(3) - 4x^(2) - 4x - 1 = 0`
`8x^(3) + 4x^(2) + 4x - 1 = 0`

Answer :B


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