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If sin alpha and cos alpha are the root...

If sin `alpha` and cos `alpha` are the roots of the equation `px^(2)` +qx+r = 0,then

A

`p^(2) + q^(2)-2pr =0`

B

`p^(2) -q^(2) +2pr =0`

C

`p^(2)-q^(2)-2pr =0`

D

`p^(2)+q^(2) + 2pr =0`

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