1.

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

Answer»

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

Answer :a


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