If the system of equations $x + ay = 0$, $az + y = 0$, and $ax + z = 0$ has infinitely many solutions, then $a$ can be: (A) $1$ (B) $-1$ (C) $0$ (D) $2$
While officially outside the syllabus, the book occasionally touches on concepts like Method of Differences (for sequences) or Leibniz Rule (for differentiation under the integral), explaining them in the context of solving JEE problems more elegantly. tata mcgraw hill mathematics for iit jee