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2) a*a*a*b= a^3*b
3) a^2+2ab+b^2=(a+b)^2
4) a*a*a*a*a*a*b*b*b=a^6*b^3
5) a+1=0
6) (a+2)(a+3)= a^2+5a+6
7) a*a*a*a*b*b*b*b*c= a^4*b^4*c
8) a^3 +1=0
9) a^3-3a^2b+3ab^2-b^3= (a-b)^3
10) (a-6)(3-b)(5a+6b)*0=0