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the equation of the chord of contact of the pair of tangents drawn to the ellipse `4x^2+9y^2=36` from the point `(m ,n)` where `mdotn=m+n ,m ,n` being nonzero positive integers, is

A

`2x+9y=18`

B

`2x+2y=1`

C

`4x+9y=18`

D

none of these

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The correct Answer is:
C
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