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Question: wrongly returning undefined for a simple limit which is defined

I have Maple 15. I am trying to calculate the limit of this function

 

((x^3-2x^2+sin(x))^(1/3))/(6x+2)

 

for x tend to +infinity. As you can get it with a rapid manual calculus, this limit is 1/6. But Maple returns undefined for this very simple limit. Why? How can i get Maple to calculate limits correctly? Derive 6 return the correct answer 

 

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