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\sqrt{2} cosα \overset{\land}{i} - \sqrt{2} sinα \overset{\land}{j}; B =- \sqrt{2} cosα \overset{\land}{j} + \sqrt{2} sinα \overset{\land}{k}

α

< π/2)

\cos^{- 1} (\sin α \cos α)

None

π - α

π - 2 α

π / 2 - 2 α

ANS : 1

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