Question 263605
The imaginary powers are circular:
i^1= sqrt(-1)
i^2 = -1
i^3 = -i
i^4 = 1
i^5 = i
so,
when you are given a power divide it by 4 and look at the remainder
25/4 = 6 r1
the r1 means that we have
i^1 = i