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The angle between $\to A =^i + 2^j -^k$ and $\to B = -^i +^j - 2^k$ is
$30^{0}$
$45^{0}$
$60^{0}$
$90^{0}$

A

30^{0}

B

60^{0}

C

90^{0}

D

45^{0}

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