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If the roots of x^(2)-bx + c=0 are "sin"...

If the roots of `x^(2)-bx + c=0` are `"sin" pi/7` and `"cos" pi/7` then `b^(2)` equals

A

c

B

1 + 2c

C

1 + c

D

`1 + c^(2)`

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