pi radians (180 degrees).
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180 degrees, or pi.
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The period of the tangent function is PI. The period of y= tan(2x) is PI over the coefficient of x = PI/2
The tangent function is a periodic function with period 180 degrees sotan(360) = tan(360-2*180) = tan(0) = 0.
A common tangent is a line which is tangent to two (or more) curves.