$(1) \,\,\,$ ${(a+b)}^3$ $\,=\,$ $a^3+b^3+3ab(a+b)$
$(2) \,\,\,$ ${(x+y)}^3$ $\,=\,$ $x^3+y^3+3xy(x+y)$
${(a+b)}^3$ $\,=\,$ $a^3+b^3+3ab(a+b)$
${(x+y)}^3$ $\,=\,$ $x^3+y^3+3xy(x+y)$
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