Let f(x) = (1−cosx) / (x4 + ax3 + bx2 + cx). If I = Lim f(x), m = Lim f(x) and n = Lim f(x), where I, m and n are non-zero finite then which of the following is incorrect

Step 1: Interpret the function and conditions.
The function is given as $f(x) = \frac{1 - \cos\{x\}}{(x^4 + ax^3 + bx^2 + cx)^2}$. The curly braces $\{x\}$ denote the fractional part of $x$.
Let $P(x) = x^4 + ax^3 + bx^2 + cx = x(x^3 + ax^2 + bx + c)$.
Let $Q(x) = x^3 + ax^2 + bx + c$. So $P(x) = x Q(x)$.

The problem states that $I = \lim_{x \to 1} f(x)$, $m = \lim_{x \to