Quote:
Originally posted by Equinox
a=1 , b=1
hence
a=b and b=a
hence
ab=a^2
hence
ab - b^2 = a^2 - b^2
hence
b(a-b) = (a+b)(a-b)
hence
b = a + b
hence
1 = 2
Any more questions? 
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If you plug in the variables at some spots here your trick does not work. You should be able to plug in the variables anywhere. This would be true if a or b where unknown maybe.