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Let f : R^+ ->{-1, 0, 1} defined by f(x)...

Let `f : R^+ ->{-1, 0, 1}` defined by `f(x) = sgn(x-x^4 + x^7-x^8-1)` where sgn denotes signum function then f(x) is (1) many- one and onto (2) many-one and into (3) one-one and onto (4) one- one and into

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