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Question: How do I incorporate sign(x) in integrals?

Question:How do I incorporate sign(x) in integrals?

blythed 15 Maple
integral
April 05 2013
1

> int(abs(x), x = -1 .. 1);
                               1
> int(sign(x)*abs(x), x = -1 .. 1);
                               1
> int('sign(x)'*abs(x), x = -1 .. 1);
                               1
> int(x, x = -1 .. 1);
                               0
What is wrong here?

I tried 'sign(x)' but that doesn't work
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