Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
If the function $f(x)=\left\{\begin{array}{c}\frac{\sin ^{2} a x}{x^{2}}, \text { when } x \neq 0 \\ k, \text { when } x=0\end{array}\right.$ is continuous at $x=0$ then $k=?$
A. a
B. $\mathrm{a}^{2}$
C. $-2$
D. $-4$
Solution:
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