The tangent is perpendicular to the radius which joins the centre of the circle to the point P. As the tangent is a straight line, the equation of the tangent will be of the form y = m x + c.

How to Find the Tangent on a Graph in Excel. The tangent is defined as the single point where a straight line meets a curved surface.

5. Find an equation of the tangent line to the curve \ (x=t-t^ {-1}\text {,}\) \ (y=1+t^2\) at \ (t=1\text {.}\) ...