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If f(x)={(1-cos10 x)/(x^2)\ \ \ ,\ \ \ x...

If `f(x)={(1-cos10 x)/(x^2)\ \ \ ,\ \ \ x<0a\ \ \ \ \ ,\ \ \ x=0(sqrt(x))/(sqrt(625+sqrt(x))-25)\ \ \ ,\ \ \ x >0` , then the value of `a` so that `f(x)` may be continuous at `x=0` , is (a) 25 (b) 50 (c) -25 (d) none of these

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