Hi I need to write a function in Python, in which I have to find the point of intersection of two tangents of a circle.

I just need the mathematical formula. I would appreciate your help.

Following are the details:

We are given following two information:

(1) Two points on the circumference of a circle: P (x1, x2) and Q (y1, y2)

(2) The angle (A) at the intersection of the two tangent lines through the points P and Q.

To find: The point (x, y) at the intersection of the tangent lines.

Thank you.