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Circular dichotomy mathematics
It is sometimes convenient and intuitive to solve the problem of circle by geometric method. And the calculation amount is small.

Set point P(2, 1), and the radius of the circle is1; The intersection of the circle and the positive semi-axis of the Y-axis is (0, 1), which is a tangent point in the tangent line passing through point P, and is set as A(0, 1), and the other tangent point B is in the fourth quadrant.

The slope of op is kop =1/2;

OP vertically divides AB,

So the slope of AB KAB =-2; (Kop *Kab=- 1)

So the equation of AB is: y- 1=Kab(x-0)=-2x point oblique type.

Namely: y=-2X+ 1.