code: public static BigComplex log(BigComplex x, MathContext mathContext) {
  		// https://en.wikipedia.org/wiki/Complex_logarithm
  		MathContext mc1 = new MathContext(mathContext.getPrecision() + 20, mathContext.getRoundingMode());
  		MathContext mc2 = new MathContext(mathContext.getPrecision() + 5, mathContext.getRoundingMode());
  
  		return BigComplex.valueOf(
  				BigDecimalMath.log(x.abs(mc1), mc1).round(mathContext),
  				x.angle(mc2)).round(mathContext);
  	}
docs: Calculates the natural logarithm of {@link BigComplex} x in the complex domain.
  
  <p>See: <a href="https://en.wikipedia.org/wiki/Complex_logarithm">Wikipedia: Complex logarithm</a></p>
  
  @param x the {@link BigComplex} to calculate the natural logarithm for
  @param mathContext the {@link MathContext} used for the result
  @return the calculated natural logarithm {@link BigComplex} with the precision specified in the <code>mathContext</code>