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27. Let f / R -> R be a function defined by f(x) = (sin 3x)/(7x) + a if x > 0 = x + 3 – b ,-if x<=0 where a, b in R f is

27. Let f / R -> R be a function defined by f(x) = (sin 3x)/(7x) + a if x > 0 = x + 3 – b ,-if x<=0 where a, b in R f is

27. Let f / R -> R be a function defined by f(x) = (sin 3x)/(7x) + a if x > 0 = x + 3 – b ,-if x<=0 where a, b in R f is continuous at x = 0 The value of a + b is