invr(%s^2) and coffg(%s^2) returns 0 instead of 1/%s^2 and 1
@sgougeon)
Reported by Samuel GOUGEON (BUG DESCRIPTION:
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invr(%s^2) returns 0 instead of 1/%s^2
ERROR LOG:
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None. Wrong result
HOW TO REPRODUCE THE BUG:
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invr(%s^2)==1/%s^2
OTHER INFORMATION:
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Source: http://mailinglists.scilab.org/Users-fr-bug-macro-invr-sci-tt4037367.html