1.

If 7theta=(2n+1)pi, where n=0,1,2,3,4,5,6, thenanswer the following questions. The equations whose roots are cos. (pi)/(7), cos. (3pi)/(7), cos. (5pi)/(7) is

Answer»

`8x^(2)+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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