Question

A={x:x2 = 1} and B {x:x4 = 1} then A U Bhai is equal to

Answer 1

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$A= \{x : x^2 = 1 \} = \{ \:-1, 1 \}$

$B = \{ x : x^4 = 1 \} = \{ -1, 1, -i, i \: \}$

Hence

$A U B = \{ -1, 1, -i, i \: \}$

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