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[" 42.For any vector a,what is the value...

[" 42.For any vector a,what is the value of "],[qquad [" (a) "|a|^(2)," (d) "x" i "|^(2)+|a times j|^(2)+|a times k|^(2)" ? "],[" (c) "3|a|^(2)," (d) "4|a|^(2)]]

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