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Find the equation of tangent to the coni...

Find the equation of tangent to the conic `x^2-y^2-8x+2y+11=0` at `(2,1)`.

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The equation of the tangent to `x^(2)-y^(2)-8x+2y+11=0` at (2, 1) is
`2x-y-4(x+2)+(y+1)+11=0`
`"or "x=2`
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