$${ \left(a+b \right) }^{ 6 }$$
$a^{6}+15a^{2}b^{4}+6ab^{5}+b^{6}+15b^{2}a^{4}+6ba^{5}+20\left(ab\right)^{3}$
$\left(a+b\right)^{6}$
