Which expression is equivalent to [tex][tex]$i^{233}$[/tex][/tex]?

A. 1
B. [tex]-1[/tex]
C. [tex]i[/tex]
D. [tex]-i[/tex]



Answer :

To determine the value of [tex]\(i^{233}\)[/tex], let's analyze the behavior of the imaginary unit [tex]\(i\)[/tex]. The imaginary unit [tex]\(i\)[/tex] has the property that [tex]\(i^2 = -1\)[/tex]. Additionally, the powers of [tex]\(i\)[/tex] follow a repeating pattern every four steps:

[tex]\[ \begin{aligned} i^1 &= i, \\ i^2 &= -1, \\ i^3 &= -i, \\ i^4 &= 1. \end{aligned} \][/tex]

This cycle repeats every four powers. Therefore, any power of [tex]\(i\)[/tex] can be reduced by finding the remainder when the exponent is divided by 4.

Let's perform this operation with the exponent 233:

[tex]\[ 233 \div 4 = 58 \text{ remainder } 1 \][/tex]

So, we can write 233 as:

[tex]\[ 233 = 4 \times 58 + 1 \][/tex]

This tells us that:

[tex]\[ i^{233} \equiv i^1 \pmod{4} \][/tex]

From our known pattern, [tex]\(i^1 = i\)[/tex].

Thus, [tex]\(i^{233} = i\)[/tex].

So, the expression equivalent to [tex]\(i^{233}\)[/tex] is:

[tex]\[ \boxed{i} \][/tex]

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