Que no 12..plz answer

Que no 12..plz answer and be the angles made by .Å and -A nus. giving Xsitzv•e X-axis. Show that rant, tane dcæs not uniquely detennine the direction of 10.] Is the vector sum of the unit vectors i and j a unit ? If no. can you multiply this sum by a scalar to get a unit vector ? Let A = 3 i + Write four B such that A B but 12. Can you have A x B —A -B with and B if one of the two vectors is zero ? 1 If A B = O, can you say that (a) A B. b' A B ? 14.1 Let A —5 i -4 j and B 7-5 i +6 j. Do we have B —kA ? Can we say; = k? 31 of 5.

Dear Student,
A×B=A·Bthe above statement is only true for the angle between the A and B is 45°.As we know , sin45°=cos45°=12Now if any of the vector is zero then the cross product as well as the dot product will have a value of zero.A×B=A·B=0
Regards

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