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If a straight line passing through the focus of the parabola `y^(2) = 4ax ` intersectts the parabola at the points `(x_(1), y_(1))` and `(x_(2), y_(2))` , then prove that `x_(1)x_(2)=a^(2)` .

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The correct Answer is:
`=a^(2)*(-1)^(2) = a^(2)`
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