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Consider y=(2x)/(1+x^2), where x is rea...

Consider `y=(2x)/(1+x^2)`, where x is real , then the range of expression `y^2 + y-2` is [a,b].find `b-4a`.

A

`[-1,1]`

B

`[0,1]`

C

`[-9//4,0]`

D

`[-9//4,1]`

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The correct Answer is:
C
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