(b^8+4)/((b^4+2*b^2+2)*(b^4-2*b^2+2))
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(b^8+4)/((b^4+2*b^2+2)*(b^4-2*b^2+2))=(b^8+4)/(b^8+4)=1(b^4+2b^2+2)*(b^4-2b^2+2)=b^8+4
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(b^8+4)/((b^4+2*b^2+2)*(b^4-2*b^2+2))=(b^8+4)/(b^8+4)=1
(b^4+2b^2+2)*(b^4-2b^2+2)=b^8+4