A) \[{{a}^{2}}\]
B) \[1/{{a}^{3}}\]
C) \[1/{{a}^{2}}\]
D) \[{{a}^{3}}\]
Correct Answer: D
Solution :
\[\underset{x\to 0}{\mathop{\lim }}\,\phi \text{=}\underset{t\to 0}{\mathop{\lim }}\,\phi \left( \frac{at}{a} \right)\] (put \[x=at\]then \[t\to 0\]as \[x\to 0\]) \[=\underset{t\to 0}{\mathop{\lim }}\,\phi (t)\,=\text{ }\underset{x\to 0}{\mathop{\lim }}\,\phi (x)={{a}^{3}}\]
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