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If alpha, beta are the roots of the equa...

If `alpha, beta` are the roots of the equation `x^2 + (sin phi -1)x-1/2 cos^2 phi = 0 (phi in R),` then the maximum value of the sum of the squares of the roots is.

A

4

B

3

C

`9//4`

D

2

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A
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