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    				| 1. | 
                                    a = hat I -hatj +hat k b=hat I -2hat j +hat k ,c =phat I +2 hat j +q hatk and d=phat I + q hat j +2 hat kare given vectors if the projection of c on a is 5sqrt(3) units and if a,b and c form a parallelopiped of volume 5 cubic unitsthen tan^(-1)(b,d)= | 
                            
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Answer»  `(PI)/(2 )`  | 
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