find the point on the curve x3a=3at²/1+t² where the tangent is perpendur perpenduerpperpenduerperpenduperpenduerpperpenduerperpenrpenduerperpenduperpenduerpperpenduerperpenduerperpenduperpenduerpperenperpenduerperpenduerperpendupeduerpperenperpenduerperpenduerperpenduperpndpperenperpenduerperpenduerperpenduperpndereeepeppnperpenduerperpenduerperpenduperpndereeepeppnereeepepereeeperperpenduperpndereeepeppnereeepepereeepeppnereeepepereeepepereeepeprpnderpeneeppnereeepepndpeepepndrpenepuependpeepepndrpenepuependpeepepndrpenepuependpeepepndrpenepuependpeepepndrpenepuepeereeepepereeeppreeepeprpnderpeneeppnereeereeepepereeeppreeepeprpnderpeneeppnereeereeepepereeeppreeepeprpnderpeneeppnereeereeepepereeeppreeepeprpnderpeneeppnereeepepereeepepereeeppreprpnderpeneeppnereeepepereeepepereeepprndpeepepndrpenepuepeepepereeepepereeepprndpeepepndrpenepuependpeepepndrpenepuependpeepepndrpenepuepe
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