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=2(1-2ab)= -4ab+2
a^2-b^2= (a-b)(a+b)=
a-b=2
a+b=1
a=3/2
b=-1/2
a^4-b^4= -4ab+2 = -4 *(3/2)*(-1/2)+2 = 3+2 = 5