दिखाइए कि \( x=0 \) पर फलन \( f(x)=\left\{\begin{array}{cc}\frac{\sin 3 x}{x}, & x \neq 0 \\ 1, ...

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दिखाइए कि \( x=0 \) पर फलन \( f(x)=\left\{\begin{array}{cc}\frac{\sin 3 x}{x}, & x \neq 0 \\ 1, & x=0\end{array}\right. \), असतत् है।
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