三角函数_8-47（Trigonometric function _8-47）.doc

三角函数_8-47（Trigonometric function _8-47） Documents from the network, I collected, finishing, and if there are omissions, errors, but also please correct me! Knowledge induction and typical examples of trigonometric functions 1. The generalization of the concept of a plane in which the rays of a plane move from one position to another around the endpoint Counterclockwise angle formed by that angle, clockwise angle formed by a ray called negative angle, without any rotation, saying it form a zero angle The starting position of the ray is called the beginning edge, and the termination position is called the end edge 2, quadrant angle concept: in the Cartesian coordinate system, so that the angle of the vertex coincides with the origin, the beginning of the angle and the axis of the non negative semi axis coincide, the end of the angle in the first quadrant, that this angle is the first quadrant of the angle If the end of the corner is on the coordinate axis, it is assumed that this angle does not belong to any quadrant The representation of the same angle at the end of 3: (1) the end is the same as the end (the end is at the end of the ray); note that the ends of the equal angles must be the same, and the ends of the same angles are not necessarily equal 1. cases with the corner of the end edge of the same, and the absolute value of the minimum degree of angle by, and cross from the radian (2) the end is collinear with the end (the end is in the line of the final edge) (3) the axis of the end and the end is symmetrical (4) the axis of the end and the end is symmetrical (5) the end and the end are symmetrical about the origin (6) the angle on the axis of the end can be expressed as: the angle on the axis of the end can be expressed as: the angle on the axis of the end can be expressed as: 2. cases of the end side and the end edge of linear symmetric, then = ____________ 4, and the end of the relationship: by the two equal quadrant and 1234 to determine 3. if the second q