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let   `veca`  , `vecb`     ,`vecc`  unit vectors. Suppose `veca`     .`vecb`       =   `veca`   .    `vecc`  =0 and the angle between   `vecb`   and      `vecc`  is  

(a)   `+-`     2(  `vecb` &nb

(b) -2 (  `vecb`  `xx`  

(c) 2 (  `vecb`  `xx` &n

(d)  (  `vecb`  `xx` &nb

Q.2. In a parallelogram ABCD, |      `vecAB` |=a,| `vecAD`     |=b and |  `vecAC`   |=c. Then ,   `vecDB`     .  `vecAB`         has the value.





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