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

If `sin alpha and cos alpha` are roots of the equation `px^2 + qx+r=0` then :
A. `p^(2) - q^(2) + 2pr = 0`
B. `(p+r)^(2) = q^(2) - r^(2)`
C. `p^(2) + q^(2) - 2 pr = 0`
D. `(p-r)^(2) = q^(2) + r^(2)`

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

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