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[" EXAMPLE 65Let fbe a differentiable fu...

[" EXAMPLE 65Let fbe a differentiable function satisfying "],[qquad f(x)+f(y)+f(z)+f(x)f(y)f(z)=14" for all "x,y,z in R],[" Then,"],[[" (a) "f'(x)<0" for all "x in R," (b) "f'(x)=0" for all "x in R],[" (c) "f'(x)>0" for all "x in R," (d) none of these "]]

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