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समतलों ` vecr. ( hati -hatj +2hatk ) =11` और ` vecr.( 2hati +hatj +hatk ) =3` के मध्य कोण है|A. ` (pi)/(2) `B. ` (pi)/(3)`C. ` ( pi)/(4)`D. `pi `

Answer» Correct Answer - B


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