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[" 54.What are the equations of the dire...

[" 54.What are the equations of the directrices of "],[" the ellipse "25x^(2)+16y^(2)=400?],[" (a) "3x+-25=0],[" (b) "3y+-25=0],[" (c) "x+-15=0],[" (d) "y+-25=0]

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