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Q)
Find $\mid\overrightarrow{x}\mid$,if for a unit vector $\overrightarrow{a},(\overrightarrow{x}-\overrightarrow{a}).(\overrightarrow{x}+\overrightarrow{a})=15.$
This question appeared in 65-1,65-2 and 65-3 versions of the paper in 2013.
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