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Which of the following is equivalent to the complex number 
i^(20) ?
Choose 1 answer:
(A) 1
(B) 
i
(C) -1
(D) 
-i

Which of the following is equivalent to the complex number i20 i^{20} ?\newlineChoose 11 answer:\newline(A) 11\newline(B) i i \newline(C) 1-1\newline(D) i -i

Full solution

Q. Which of the following is equivalent to the complex number i20 i^{20} ?\newlineChoose 11 answer:\newline(A) 11\newline(B) i i \newline(C) 1-1\newline(D) i -i
  1. Definition of i: To solve for i20i^{20}, we need to remember that ii is the imaginary unit, which is defined by i2=1i^2 = -1. We can use this property to simplify i20i^{20}.\newlinei20=(i2)10=(1)10i^{20} = (i^2)^{10} = (-1)^{10}
  2. Simplifying i20i^{20}: Since (1)10(-1)^{10} is raising 1-1 to an even power, the result will be 11.\newline(1)10=1(-1)^{10} = 1
  3. Result of i20i^{20}: Now we have found that i20i^{20} is equivalent to 11, which matches one of the given choices.

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