Then substituting the values of g, f and c in (i) we can find the required equation of the circle. Solved examples to find the equation of the circle passing through three given points: 1. Find the equation of the circle passes through three points (1, 0), (-1, 0) and (0, 1). Solution:
How to calculate a tangent? If you want to find the tangent on the point x, you do three things: Insert x into the function, so you got the point where the tangent touches. Insert x into the derivation, so you got the slope m of the tangent. Insert m and the point into , then you got b.