please solve the circled one..
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a+b(a^2+b^2-ab)+1+3ab
a+b(a^2+b^2-ab+1+3ab)
a+b(a^2+b^2+2ab+1)
a+b(a^2+b^2-ab+1+3ab)
a+b(a^2+b^2+2ab+1)
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