For what value of \( k \) is the function \( f(x)=\left\{\begin{array}{ll}\frac{\sin 2 x}{x}, & ...

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For what value of \( k \) is the function \( f(x)=\left\{\begin{array}{ll}\frac{\sin 2 x}{x}, & x \neq 0 \\ k & \text { continuous at } x=0 \text { ? }\end{array}\right. \)
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