1. Common names and terms: inclination angle, elevation angle, depression angle, azimuth angle and direction angle.

2. Correlation point method of trajectory equation: use the coordinates x and y of moving point Q to represent the coordinates x0 and y0 of related point P, then substitute them into the curve equation satisfied by the coordinates (x0, y0) of point P, and simply sort them to get the trajectory equation of moving point Q.. This method of solving trajectory equation is called correlation point method. 3. Geometric series formula: S(n+m)=S(m)+q2mS(n).

4. Cubic function curve is actually a figure with central symmetry. It has a symmetrical center. The solution is that the derivative after the second derivative is 0, the root X is the abscissa of the center, and the ordinate can be defined by bringing X into the original function. In addition, only one straight line must pass through the center tangent to both sides.

5. Parity of composite function: even if it is internal, it is odd if it is external.