Infinity.
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The angle between the radius and the tangent is a right angle of 90 degrees.
90 degree
When you graph a tangent function, the asymptotes represent x values 90 and 270.
tan6=cot(90-6) = cot 84
The tangent function will generate a calculator "math error" if the angle in questin is ±90 degrees. For these angles, the tangent function is not defined.