What is i³?

Answer: In simple mathematics, i stands for the imaginary number i denote an, and the value of i stands at √−1

So by the elaboration of i, the power of i can be calculated by multiplying the value √−1

By itself and the power that is standing at the top of it can be used to simplify the problem, so in the above question of   i³ is as follows 

i³=iii=√-1√-1√-1=√(-1)(-1)(-1)=√-1=i