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Question: How do I find the maximize and minimize of this funciton?

Question:How do I find the maximize and minimize of this funciton?

minhthien2016 355 Maple
June 19 2018
1

I want to find the maximize and minimize of the function
f:=x->(cos(x)+sqrt(3)*sin(x))/(cos(x)+sin(x)+2);
I tried 
minimize(f(x), x, location = 'true');
and
maximize(f(x), x, location = 'true');
But I didn't get the results.  How do I find the maximize and minimize of above funciton?
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