the tangent of an angle is equal to the length of the opposite side from the angle divided by the length of the side adjacent to the angle.
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45 degrees
There can be no tangent side. The tangent of an angle, in a right angled triangle, is a ratio of the lengths of two sides.
1/(tangent of angle)
Tanx can be written as tan0.5x by dividing it by 2. tanx1/2=tan0.5x --- I doubt that you can, since the tangent of the whole angle is a function of the tangent of the half-angle and of the secant of the whole angle. Please see the link.
tan(30 deg) = 0.5774, approx.