Calculate the involute of a pressure angle using inv(φ) = tan(φ) - φ.
The pressure angle must be a finite number. If the tangent is undefined, the involute is undefined too.
With a 20 degree pressure angle, the involute is tan(20 deg) - 20 deg in radians.
The output is dimensionless. The angle input can be degrees or radians.
The involute formula subtracts the angle from its tangent, so tangent must be defined.
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