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```        i am not understandin the concept of dot product nd cross product...
plzz explain me ....i am not understanding WHY is it used for????thnku```
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
The  Dot Product  We define the dot product of two vectors        v = ai + bj  and   w = ci + dj   to be
v .  w = ac + bd

The Cross Product Between Two Vectors

Definition     Let  u = ai + bj + ck  and  v = di + ej + fk be vectors then we define the  cross product v x  w by the determinant of the matrix:

W e can compute this determinant as

=  (bf - ce) i + (cd - af) j + (ae - bd) k

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.
Sagar Singh
B.Tech IIT Delhi

```
7 years ago
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