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माना कि f : R rarr R इस प्रकार परिभाषित...

माना कि `f : R rarr R` इस प्रकार परिभाषित है
`f(x) = {{:("1, यदि" x gt 0),("0, यदि " x = 0),("-1, यदि " x lt 0):}`
फलन f के एकैकी आच्छादक होने की जाँच करें।

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