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The equation (cos beta-1) x^(2)+(cos bet...

The equation `(cos beta-1) x^(2)+(cos beta) x+sin beta=0` in the variable x has real roots, then `beta` is in the interval

A

a.` (0,2 pi)`

B

b.`(-pi, 0)`

C

c.`(-pi/2, pi/2)

D

d.`(0, pi)`

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A
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