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If f(x) = {((1-cos 4x)/x^(2), x lt 0),(a...

If `f(x) = {((1-cos 4x)/x^(2), x lt 0),(a, x =0),((sqrtx)/(sqrt(16+sqrt(x))-4), xgt 0):}` then the value of a for which f(x) is continuous at x = 0 is

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