>>21
is L'Hopital, not L'Hospital
>>1
Imaginary numbers are a tool used to represent and predict reality, just like irrational numbers, rational numbers, integers, and counting numbers. They are useful for, say, multiplying cos(t) with 2*cos(t + 30 degrees). Euler's Identity with e^(j*t) = cos(t) + j*sin(t)
note: EE here so I use sqrt(-1) = j by habit. Also the j comes first, so you write it as j3.33 or something like that.