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Domain of advanced piecewise functions

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f(x)=\begin{cases} \dfrac{4}{(x+3)(x+1)}&\text{if } x\neq -2 \\ \\ 18 & \text{if } x= -2 \end{cases}

What is the domain of function $f$ ?

Choose 1 answer:

A
$\{x\in \mathbb R \ |\ x\neq -3,x\neq-2, \text{ or } x\neq-1\}$
B
$\{x\in \mathbb R \ |\ x\neq -3\text{ or }x\neq-1 \}$
C
$\{x\in \mathbb R \ |\ x\neq-2 \}$
D
$\{x\in \mathbb R \ |\ x\neq -2\text{ or }x\neq0 \}$

Domain of advanced piecewise functions

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