MCQ
$\frac{d}{d x}\left(\log _a x\right)$ is equal to :
- ✓$\frac{1}{x \cdot \log _e a}$
- B$\frac{\log _e a}{x}$
- C$\frac{1}{x}$
- D$\frac{x}{\log _e a}$
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$(A)$ $b+c=4 a$
$(B)$ $b+c=2 a$
$(C)$ locus of point $A$ is an ellipse
$(D)$ locus of point $A$ is a pair of straight lines
$[A]$ $2 a, 4,1$ $[B]$ $2 a, 8,1$ $[C]$ $a, 4,1$ $[D]$ $a, 4,2$