Because the tangent is a function of with the angle as its argument.
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Angle a, by itself has no value. You must first assign a value to a to get the value of tan a.
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.
To obtain the percent value for an angle (in slopes and inclines), calculate the tangent of that angle in degrees, then multiply the figure by 100.
Tangent is a function that can have any real value. Therefore one tangent can take any value in (-∞, ∞).
tan (theta x theta) : must square the value of the angle, theta, before applying the trig function, tangent.