In a triangle $PQR$, $\angle R = \pi / 2$. If $\tan(P/2)$ and $\tan(Q/2)$ are the roots of the quadratic equation $ax^2 + bx + c = 0$, where $a \neq 0$, then which of the following is true?

  • A
    $c = a + b$
  • B
    $a = b + c$
  • C
    $b = a + c$
  • D
    $b = c$

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