Zero
and any other multiple of 180 degrees.
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The inverse tangent, denoted as arctan or tan^(-1), of 1.4737 is approximately 56.05 degrees when measured in degrees or approximately 0.980 radians when measured in radians. This value represents the angle whose tangent is 1.4737. In trigonometry, the inverse tangent function helps determine the angle when the tangent ratio is known.
The inverse tangent is 0.83448691252602 degrees.
45 degrees
Usually there is an inverse key or( tan -1 )key for this
You cannot.