Lymphocytes = B cells (antibodies) + T cells (cell-mediated immunity).
Lymphocytes are a type of white blood cell (WBC) responsible for immune responses in the body.
There are two types of lymphocytes:
Find the values of \( x, y, z \) if the matrix \( A \) satisfies the equation \( A^T A = I \), where
\[ A = \begin{bmatrix} 0 & 2y & z \\ x & y & -z \\ x & -y & z \end{bmatrix} \]