If \( f(x)=\left\{\begin{array}{ll}\frac{1-\cos 10 x}{x^{2}}, & x0 ...

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If \( f(x)=\left\{\begin{array}{ll}\frac{1-\cos 10 x}{x^{2}}, & x0 \\ a & , \quad x=0, \text { then the value of a so that } f(x) \text { may be continuous at } \\ \frac{\sqrt{x}}{\sqrt{625+\sqrt{x}-25}}, & x0\end{array}\right. \) \( x=0 \), is
(a) 25
(b) 50
(c) \( -25 \)
(d) none of these
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