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Let $$f : R \rightarrow R$$ be defined by$$f(x) = \frac{x^2 - 3x - 6}{x^2 + 2x + 4}$$Then which of the following statements is (are) TRUE?
f is decreasing in the interval (โ2, โ1)
f is increasing in the interval (1, 2)
f is onto
Range of f is $$\left[-\frac{3}{2}, 2\right]$$
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