code: public static float tan(double angle) {
          int idx = GenericMath.floor(angle * SIN_CONVERSION_FACTOR);
          return sinRaw(idx) / cosRaw(idx);
      }
docs: Tangent calculations using a table.<br> <i>sin(angle) / cos(angle)</i><br><br> <p/> <b>No interpolation is performed:</b> Accuracy is up to the 6th decimal place
  
  @param angle in radians
  @return the tangent of the angle