## 1. Scalar triple product in terms of components.

2. The condition is necessary.

3. The condition is sufficient.

Note :

4. Right – Hand and Left – Handed system of three vectors.

5. Volume of tetrahedron in terms of the position vectors of its four vertices.

6. Scalar product of four vectors.

7. Lagrange’s identity.

8. Geometrical interpretation.

9. Linear relation connecting four vectors.

10. Reciprocal system of vectors.

11. Properties of reciprocal system of vectors.

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