It is known that in the plane rectangular coordinate system, the coordinate of point a is (4,0), point B is any point on the positive half axis of Y axis, AC = 2, and point C is in the first quadrant, then tan The value range of ∠ BOC is ()

It is known that in the plane rectangular coordinate system, the coordinate of point a is (4,0), point B is any point on the positive half axis of Y axis, AC = 2, and point C is in the first quadrant, then tan The value range of ∠ BOC is ()

Draw a simple diagram: 1 to root 3

Ask a solid geometry problem to draw the figure of x ^ 2 / 4 + Z ^ 2 / 9 = 2x in the space rectangular coordinate system

The projection is centered on (4,0,0) in the XZ plane,
The ellipse of a = 4, B = 6. Is actually an elliptical surface stretched by Y axis
Equation: ((x-4) / 4) ^ 2 + (Z / 6) ^ 2 = 1

In Cartesian coordinates, the set of points on the coordinate axis can be expressed as ()
A. {(x, y) | x = 0, y ≠ 0 or X ≠ 0, y = 0} B. {(x, y) | x = 0 and y = 0} C. {(x, y) | xy = 0} D. {(x, y) | x, y is not zero at the same time}

For a point (x, y) on the x-axis, there must be y = 0; for a point (x, y) on the y-axis, there must be x = 0, xy = 0. In a rectangular coordinate system, the set of points on the x-axis {(x, y) | y = 0}, in a rectangular coordinate system, the set of points on the y-axis {(x, y) | x = 0}, the set of points on the y-axis can be expressed as {(x, y) | y =

In Cartesian coordinates, the set of points on the coordinate axis can be expressed as______ ．

In the rectangular coordinate system, the set of points on the x-axis {(x, y) | y = 0}, in the rectangular coordinate system, the set of points on the y-axis {(x, y) | x = 0}, the set of points on the coordinate axis can be expressed as {(x, y) | y = 0} {(x, y) | x = 0} = {(x, y) | xy = 0}. So the answer is {(x, y) | xy = 0}