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\underset{A}{\to} ও \underset{B}{\to}

\hat{η} = \frac{| \underset{A}{\to} \times \underset{B}{\to} |}{\underset{A}{\to} \times \underset{B}{\to}}

\hat{η} = \frac{\underset{A}{\to} \times \underset{B}{\to}}{| \underset{A}{\to} \times \underset{B}{\to} |}

\hat{η} = \frac{\underset{A}{\to} \times \underset{B}{\to}}{| \underset{A}{\to} . \underset{B}{\to} |}

\hat{η} = \frac{\underset{A}{\to} . \underset{B}{\to}}{| \underset{A}{\to} . \underset{B}{\to} |}

ANS : 2

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