Question

plz explain 4th root of unity

someone scolded me previously saying "don't post silly things idiot -_-" so this question is for that person(・'v`・)？？​

Answer 1

4th root of unity means a number (complex) of form z^4=1

putting value of z as 1 i or their negatives you get the answer. such that i=root(-1) ...

so there are 4 4th root of unity 1 i -1 and -i