/**
* Calculates the cosine (cosinus) of {@link BigComplex} x in the complex domain.
*
* @param x the {@link BigComplex} to calculate the cosine for
* @param mathContext the {@link MathContext} used for the result
* @return the calculated cosine {@link BigComplex} with the precision specified in the <code>mathContext</code>
*/
public static BigComplex cos(this BigComplex x, MathContext mathContext)
{
MathContext mc = new MathContext(mathContext.getPrecision() + 4, mathContext.getRoundingMode());
return(BigComplex.valueOf(
BigDecimalMath.cos(x.re, mc).multiply(BigDecimalMath.cosh(x.im, mc), mc).round(mathContext),
BigDecimalMath.sin(x.re, mc).multiply(BigDecimalMath.sinh(x.im, mc), mc).negate().round(mathContext)));
}