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Find the equaiton of the tangents to the...

Find the equaiton of the tangents to the hyperbola `x^2 - 2y^2 = 18` which are perpendicular to the line `x-y=0`.

A

a)x+y=3

B

b)x+y+3=0

C

c)`x+y=3sqrt2`

D

d)`x+y+3sqrt2=0`

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