code: public static BigComplex exp(BigComplex x, MathContext mathContext) {
  		MathContext mc = new MathContext(mathContext.getPrecision() + 4, mathContext.getRoundingMode());
  
  		BigDecimal expRe = BigDecimalMath.exp(x.re, mc);
  		return BigComplex.valueOf(
  				expRe.multiply(BigDecimalMath.cos(x.im, mc), mc).round(mathContext),
  				expRe.multiply(BigDecimalMath.sin(x.im, mc), mc)).round(mathContext);
  	}
docs: Calculates the natural exponent of {@link BigComplex} x (e<sup>x</sup>) in the complex domain.
  
  <p>See: <a href="https://en.wikipedia.org/wiki/Exponential_function#Complex_plane">Wikipedia: Exponent (Complex plane)</a></p>
  
  @param x the {@link BigComplex} to calculate the exponent for
  @param mathContext the {@link MathContext} used for the result
  @return the calculated exponent {@link BigComplex} with the precision specified in the <code>mathContext</code>