1.

The tangents at the points (at_(1)^(2),2at_(1)) , (at_(2)^(2),2at_(2)) on the parabola y^(2)=4ax are al right angles if

Answer»

`t_(1)=t_(2)`
`t_(1)=-t_(2)`
`t_(1)t_(2)=2`
`t_(1)t_(2)=-1 `

ANSWER :B


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