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wHICH OF THE FOLLOWING ARE RATIONAL FUNCTION AND WHICH IS NOT
1. f(x)= x + 5
X+6

2. f(×)=√x
X+2

3. f(x)=×2-2×+1
×+1

4. f(×)=×+2
2+3/4-2×3

5. f(×)=×3
×-2​