Question: Problem with Evalf


I am a new Maple-user and i am experiencing a problem. When I type: restart;a:=sin(Pi/8);evalf(a,2) I get the wrong answer: 0.36! It should be: 0.38.

But when when I type: restart;a:=sin(Pi/8);evalf(a,3) I get 0.382, which is better but still not entriely correct: it should be 0.383.

What is going wrong?

Many thanks in advance,

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