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सिद्ध कीजिए कि `f(x)=x^(3)` द्वारा प्रदत्त फलन `f:R rarr R` एकैक (Injective) है ।

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सिद्ध कीजिए कि `f(x)=x^(3)` द्वारा प्रदत्त फलन `f:R rarr R` एकैक (Injective) है ।
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`f:R rarr R` तथा `f(x)=x^(3)`
माना `x,y in R`
तथा `f(x)=f(y)`
`rArr x^(3)=y^(3)`
`rArr x=y`
`:.f` एकैकी है । `" "` यही सिद्ध करना था ।
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