The positive and negative representation format of quadrant is "Quadrant"/"+or-":
1, sine function: y=sinx, one/+,two/+,three/-,four/-.
2. Cosine function: y=COSX, one/+,two/-,three/-,four/+.
3. Tangent function: y=Tanx, one/+,two/-,three/+,four/-.
4. Cotangent function: y=cotx,-/+,two/-,three/+,four/-.
Four quadrant coordinate values:
The first quadrant: (positive+,+positive), the abscissa and ordinate have the same sign, and it is denoted as XY>0. The second quadrant: (negative-,+positive), which has different symbols in horizontal and vertical coordinates and is expressed as xy.
Introduction to quadrant:
1, quadrant is four areas divided by horizontal axis and vertical axis in plane rectangular coordinate system, and each area is called a quadrant. Mainly used in trigonometry and coordinate system in complex numbers.
2. The quadrant takes the origin as the center, and the X axis and Y axis are the dividing lines. The upper right is called the first quadrant, the upper left is called the second quadrant, the lower left is called the third quadrant, and the lower right is called the fourth quadrant. The points on the coordinate axis do not belong to any quadrant.
3. The original meaning of quadrant is 1/4 bisector. Quadrant is a rectangular coordinate system, and its founder is Descartes.
4. In the plane rectangular coordinate system, the plane is divided into four areas by the horizontal axis and the vertical axis, and these four areas are four quadrants.
5. Quadrant is divided into four quadrants, I, II, III and IV, with the origin as the center, the horizontal axis and the vertical axis as the dividing line, and counterclockwise from the upper right. The origin and coordinate axis do not belong to any quadrant.