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The interval (-1, 1) is the range of A)`x/(1+|x|)` B) `cos x - sin x ` C) `x^4+4x^3+1` D) `|x|/(1+x)`

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The interval (-1, 1) is the range of A)`x/(1+|x|)` B) `cos x - sin x ` C) `x^4+4x^3+1` D) `|x|/(1+x)`
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Best answer
x=-3/4
`(3/4)/(1-(3/4))=3`
Option A is correct.
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