defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Vector Algebra Scalar and Vector Product
What is \(\rm \left( {2\vec a - 3\vec b} \right) \times \left( {2\vec a + 3\vec b} \right)\)equal to?
1
\(\vec 0\)
2
\(\rm \vec a \times \vec b\)
3
\(\rm 12\left( {\vec a \times \vec b} \right)\)
4
\(\rm 4 {\left| {\vec a} \right|^2} - 9{\left| {\vec b} \right|^2}\)