(2) coordinate system

(1) plane graphic changes under the understanding of functions in coordinate system, and telescopic transformation in Cartesian coordinate system.

(3) Metal-to-metal understanding of polar coordinate system represented by polar coordinate system describes the position of a point in polar coordinate system and the polar coordinates of the difference between the position in Cartesian coordinate system and the position in Cartesian coordinate system.

(4) The simple figure of the equation given in the polar coordinate system expressed in polar coordinates (such as the pole or the central circle where the pole goes straight out of the pole). When these figures are compared with the equations in polar coordinate system and Cartesian coordinate system, it should be understood that the plane figures of the equations have the significance of choosing appropriate coordinates.

2。 parameter equation

(1) Understand the parameter equation and understand the meaning of parameters.

(2) Choose appropriate parameters to write parameter equations of straight lines, circles and ellipses.

(twenty-three) to speak in unequal elections.

1。 Understand the geometric meaning of absolute value and absolute value inequality and prove the following inequality:

( 1)

(2)

2。 The following types will be used:

Geometric significance of solving the absolute value of inequality.

3。 The basic method of proving inequality;

Through some simple questions, we can understand the proved inequalities: comparison method, synthesis method, analysis method, reduction to absurdity and scaling law.