A) \[\left\{ -1,1,\text{ }0 \right\}~\]
B) \[\left\{ cos\text{ }1,\text{ }cos\text{ }2,\text{ }1 \right\}\]
C) \[\left\{ -cos\text{ }1,\text{ }cos\text{ }1,\text{ }1 \right\}\]
D) None of these
Correct Answer: B
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