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  4. The value of (1+i)5 ×(1-i)5 is

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Q. The value of $(1+i)^5 \times(1-i)^5$ is

Complex Numbers and Quadratic Equations

Solution:

$(1+i)^5(1-i)^5 =\left(1-i^2\right)^5 $
$ =2^5=32$