The syntax of a atan function
function function: Returns the inverse tangent value.
The tangent value is equal to the number parameter value because it is an angle. The returned angle value is expressed in radians, and the range is-PI/2 to PI/2.
The tangent value of the number angle.
Note: To use degrees to represent an inverse tangent value, multiply the result by 180/pi () or by using the DEGREES function.
Second, the use of Atan function
We have verified in the previous article that the formula
The result returned is 1.
Now we can take advantage of the Atan function so that the result of Tan (0.785398163397448), in turn, gets 0.785398163397448, and the formula is simple, as follows:
=atan (TAN (0.785398163397448))
Now look at two more examples:
=atan (1) *180/pi () return 45
=degrees (Atan (1)) return 45