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Home  >>  CBSE XII  >>  Math  >>  Model Papers
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If two vectors \( \overrightarrow a \: and \: \overrightarrow b\) are such that \( |\overrightarrow a|=2,|\overrightarrow b|=1\: and \: \overrightarrow a.\overrightarrow b=1\), then find the value of \( (3\overrightarrow a-5\overrightarrow b).(2\overrightarrow a+7\overrightarrow b).\)

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