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Let ¯a,¯b and ¯c be non-zero vectors such that (¯aׯb)ׯc=13|¯b||¯c|¯a. If θ is the acute angle between the vectors ¯b and ¯c, then sinθ equals


( A ) 23
( B ) 13
( C ) 23
( D ) 223

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