1. $a^3+b^3=$

• A. $a^3+b^3+3a^{2}b+3a{b}^2$
• B. $a^3+b^3+3a^{2}b+3a{b}^2$
• C. $a^3+b^3+3a^{2}b+3a{b}^2$
• D. $a^3+b^3+3a^{2}b+3a{b}^2$

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