Since the sign can be 0 or 1 maybe that's why it's confused. If you
give `a` a sign it works:
>>> var('a',positive=True)
a
>>> f2=abs(a)*E**(-abs(a)*x)
>>> integrate(f2,(x,0,oo))
1
>>> limit(integrate(abs(a)*exp(-abs(a)*x), x), x, oo)
0
/c
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