Method exp

__test__/theorem.js:16–21

(n)

  }
  
  exp(n) {
  	if (n.isComplex) {
  		return n.exp()
  	}
  	return new BigNumber(Math.exp(new BigNumber(n).toNumber()))
  }
  factorial(n) {
      if (new BigNumber(n).eq(0)) {
          return new BigNumber(1);