Question: Why won't the if statement to this function work?

February 10 2014 yendis 30
Maple

1

if ((a.d-b.c)=0) then print([0,0,0,0])
fi;
MARK:=(a,b,c,d)->[d/(a.d-b.c),-b/(a.d-b.c),-c/(a.d-b.c),a/(a.d-b.c)];

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