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Let : f(x) {:(=(1-cos 4x)/(x^(2))", ...

Let : f(x) ` {:(=(1-cos 4x)/(x^(2))", ... "x lt 0 ),(= a", ... " x = 0 ),(= (sqrt(x))/(sqrt(16-sqrt(x))-4)", ... "x gt 0 ):}`
If f(x) is continuous at x = 0 , then : a =

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