The derivative is generally tangent equation, and it is enough to remember three points.

The derivative of the tangent point is the slope of the tangent.

The tangent point is on the tangent line.

3. The tangent point is on the curve

With these points in mind, it is certainly no problem to find the tangent equation with the derivative of the college entrance examination.

Explain briefly.

Point 1 → Find the slope (the general equation is set to point oblique type)

2

→

The simplification of point inclination instead of point penetration is tangent equation.

three

→ Ten thousand points only know the abscissa (or ordinate), so as to find out the coordinates of the point.

Attachment: If you don't know the abscissa and ordinate, set them according to the above three points and bring them in.