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From an external point P tangents are dr...

From an external point P tangents are drawn to the parabola, find the equation to the locus of P when these tangents make angles ` theta _(1) and theta _(2)` with the axis, such that
`theta _(1) + theta _(2) ` is constant ` ( = 2 alpha )`

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The correct Answer is:
` y = ( x - a) tan 2 a `
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