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12. Let f(x)= a + 2b cosx, b > 0. If domain and range of f(x) are the same set, then (b-a) isequal to :

Answer» 12. Let f(x)= a + 2b cosx, b > 0. If domain and range of f(x) are the same set, then (b-a) isequal to :


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