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OpenStudy (anonymous):
Prove that the two tangents to a parabola from any point on the directrix are perpendicular.
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OpenStudy (anonymous):
To put it into context, I know that..\[\frac{ d }{ dx }x^2=2x\]..and that the directrix of that parabola is..\[(0,-\frac{ 1 }{ 4 })\]Please help me with this proof...
OpenStudy (anonymous):
The statement doesn't make sense to me...
OpenStudy (anonymous):
|dw:1393822005233:dw|
OpenStudy (anonymous):
|dw:1393822066034:dw|
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