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If "sec"^(2)(pi)/(7) and "tan"^(2) (pi)/...

If `"sec"^(2)(pi)/(7) and "tan"^(2) (pi)/(7)` are the roots of the equation `ax^(2)+bx+c=0`, then `(5a^(2)-(b^(2)-c^(2)))/((2a-c)^(2))` (wherever defined) is equal to

A

4

B

2

C

1

D

`-1`

Text Solution

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The correct Answer is:
C
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