If \( A=\left\{\mathrm{x} \in \mathrm{C}: \mathrm{x}^{2}=1\right\} \) and \( \mathrm{B}=\left\{\...
If \( A=\left\{\mathrm{x} \in \mathrm{C}: \mathrm{x}^{2}=1\right\} \) and \( \mathrm{B}=\left\{\mathrm{x} \in \mathrm{C}: \mathrm{x}^{4}=1\right\} \), then \( \mathrm{A} \Delta \mathrm{B} \) is equal to
(A) \( \quad\{-1.1\} \)
(B) \( \quad\{-1.1 .0 .-\mathrm{i}) \)
(C) \( \{-\mathrm{i}, \mathrm{i}\} \)
(D) None of these.
\( \mathrm{P} \)
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