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[" If "a" and "hat b" are two unit vecto...

[" If "a" and "hat b" are two unit vectors,then "],[" the vector "(hat a+hat b)times(hat a timeshat b)" is parallel "],[" to "],[[" (a) "(hat a-hat b)," (b) "(hat a+hat b)],[" (c) "(2hat a-hat b)," (d) "(2hat a+hat b)]]

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