It is pi radians.
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Cotangent is a trigonometric function. It is the reciprocal of the tangent.
Cotangent of ∞ is not π/2. It's actually nonexistent since cotangent is the continually oscillating function.
The cotangent of 60 degrees is 1\(3^1\2).
cotangent(50) = 1/tangent(50) = 0.8391