Find the range of the function " ...

Find the range of the function
`" " f(x)=(sin^(2)x+sinx-1)/(sin^(2)x-sinx+2)`.

Verified by Experts

The correct Answer is:

`R_(f)=[(3-2sqrt(11))/7,1/2] cup [3,(3+2sqrt(11))/7] cup {1}`

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