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[" (3) "lim(x" if "f(x))=(cos x)/(x+1),x...

[" (3) "lim_(x" if "f(x))=(cos x)/(x+1),x!=-1," then for what "],[" value of "alpha,f(f(x))=x?],[[" (1) "sqrt(2)," (2) "-sqrt(2)],[" (3) "-1," (4) "2]]

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