MCQ
Equation of directrix for parabola $y^2=12 x$ is :
- A$x=3$
- B$y=3$
- ✓$x=-3$
- D$y=-3$
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The domain of the function f defined by $\text{f(x)}=\sqrt{4-\text{x}}+\frac{1}{\sqrt{\text{x}^2-1}}$ is equal to.
$(–\infty, –1) \cup (1, 4]$
$(–\infty, –1] \cup (1, 4]$
$(–\infty, –1) \cup [1, 4]$
$(–\infty, –1) \cup [1, 4)$