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If `alpha` and `beta` are the roots of the equation `ax^(2)+bx+c=0` then `(alpha+beta)^(2)` is …………..

A

`-(b^(2))/(a^(2))`

B

`(c^(2))/(a^(2))`

C

`(b^(2))/(a^(2))`

D

`(bc)/(a)`

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