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a circle can have only 2 parallel tangents touchin the 2 opp.ends of a cirlce; a circle can have two tangents drawn from one point outside the circle
As far as I know, you can find only the equation of pair of tangents from any point outside the circle! Equation for the same goes as follows: S*S1=T^2, where S is the equation of circle S1 is the equation of circle at the required point, And T is xx1+yy1=r^2(general case)