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Equations of tangents to the ellipse x^2...

Equations of tangents to the ellipse `x^2/9+y^2/4=1` which are perpendicular to the line `3x + 4y = 7,` are

A

`4x-3y= pm sqrt(20)`

B

`4x-3y= pm sqrt(12)`

C

`4x-3y=pmsqrt(2)`

D

`4x-3y=pm1`

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