Method times

__test__/theorem.js:2105–2118

(complex)

  			return this.times(...arguments)
  		}
  		times(complex) {
  			if (!complex.isComplex) {
  				throw "[TheoremJS]: Complex operation require complex numbers"
  			}
  			const a = this.a
  			const b = this.b
  			this.a = a.times(complex.a).minus(b.times(complex.b))
  			this.b = a
  						.plus(b)
  						.times(complex.a.plus(complex.b))
  						.minus(a.times(complex.a))
  						.minus(b.times(complex.b)) // 	(a+b)(c+d)-ac-bd.
  			return this
  		}
  		toString() {
  			return `${this.a.toString()} ${this.b.lt(0) ? "-" : "+"} ${this.b.abs().toString()}i`
  		}