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Prove that the equation of any tangent t...

Prove that the equation of any tangent to the circle `x^2+y^2-2x+4y-4=0` is of the form `y=m(x-1)+3sqrt(1+m^2)-2.`

A

`y = m ( x-1) + 3 sqrt( 1+ m^(2)) - 2 `

B

`y = m x+3 sqrt( 1+ m^(2))`

C

`y = mx + 3sqrt ( 1+ m^(2)) -2`

D

None of these

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