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For the function f(x)=x "cos" 1/x, x ge1...

For the function `f(x)=x "cos" 1/x, x ge1`

A

for the least one`x in [1, oo), f(x+2)- f(x)lt2`

B

`lim_(xrarroo) f^'(x)=1`

C

for all `x in [1,oo), f(x+2)- f(x).2`

D

`f^'(x)` is strictlydecreasing in [1,oo]`.

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