Differentiate algebraic and trigonometric equations, rate of change, stationary points, nature, curve sketching, and equation of tangent in Higher Maths.

The tangent will have an equation in the form y = m x + c so to find the equation you need to find the values of m and c. First, find m, the gradient of the tangent.

But there's a trick that uses calculus and the magic of dividing by zero. Instead of finding the tangent line, it's much easier to find the slope of a line that touches the curve at two points.