a B^A <0 => B is essentially negative and A is Odd number. For B=A = -1 and for B=-1 and A=3 the values are different.
b A^B <0 => A is essentially negative and B is an Odd number. For similar values the equation gives different outcomes.
for a+b, A=B= -1 and for A= -3 and B= -1 the values are different.Hence IMO E.
Under such condition we have to always check for A=B values and A> or <B values.
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