What are the main topics related in preparation of Indian Engineering Services?
If [math]\vec{A}+\vec{B}=(7\hat{j}+7\hat{k})[/math] and [math]\vec{A}-\vec{B}=(-\hat{j}+\hat{k})[/math] then what are the magnitude of [math]\vec{A}[/math] and [math]\vec{B}[/math]?