If f(x)=(3x^2+a x+a+1)/(x^2+x-2), then w...

If `f(x)=(3x^2+a x+a+1)/(x^2+x-2),` then which of the following can be correct (a) `("lim")_(xto1)f(x) ex i s t s a=-2` (b) `("lim")_(xto-2)f(x) ex i s t s a=13` (c) `("lim")_(xto1)f(x)=4/3` (d)`("lim")_(xto-2)f(x)=-1/3`

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