If the function f: r r is defined by f(x) = \xl(x - sin x), then which of the following statements is true? (a)f is one-one, but not onto (b) f is onto, but not

If the function f: R R is defined by f(x) = \xl(x - sin x), then which of the following statements is TRUE? (A)f is one-one, but NOT onto (B) f is onto, but NOT one-one (C)f is BOTH one-one and onto (D)f is NEITHER one-one NOR onto