If the function \( f(x)=\left\{\begin{array}{c}\frac{\sin ^{2} a x}...

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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 \( k=? \)
\( \mathrm{P} \)
W
(a) \( a \)
(b) \( a^{2} \)
(c) \( -2 \)
(d) \( -4 \)
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