ATAN2(x_num, y_num)

Returns the arc-tangent of the specified x and y co-ordinates.

x_numThe x-coordinate of the point.
y_numThe y-coordinate of the point.

* The arctangent of an angle is the inverse of the TAN function.
* ATAN2(x_num , y_num) equals ATAN(y_num / x_num), except that "x_num" can equal 0 in ATAN2.
* The arctangent is the angle from the x-axis to a line containing the origin (0, 0) and a point with coordinates ("x_num", "y_num").
* If "x_num" = 0 and "y_num" = 0, then #DIV/0! is returned.
* The returned angle is given in radians between -PI and PI (excluding -PI).
* A positive result represents an anti-clockwise angle (from the x-axis).
* A negative result represents a clockwise angle (from the x-axis).
* If your argument is in degrees, multiple it by PI/180 to convert it to radians.
* If you want to convert the result from radians to degrees, multiply it by 180/PI.
* You can use the DEGREES function to convert from radians to degrees.
* For a working example refer to the Trigonometry page.
* For the Microsoft documentation refer to

1=ATAN2(1,1) = 0.785
2=ATAN2(-1,-1) = -2.356
3=ATAN2(2,3)=ATAN(3/2) = True
4=ATAN2(-100,-100) = -2.356
5=ATAN2(0,1) = 1.571
6=ATAN2(0,5) = 1.571
7=ATAN2(0,-0.5) = -1.571
8=ATAN2(-0.5,0) = 3.142
9=ATAN2(-1,-1)*180/PI() = -135
10=ATAN2(0,0) = #DIV/0!
11=ATAN2("some text",1) = #VALUE!
12=ATAN2(1,"some text") = #VALUE!

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