Evaluate
\left(x+y\right)^{18}
Expand
x^{18}+43758x^{8}y^{10}+31824x^{7}y^{11}+18564x^{6}y^{12}+8568x^{5}y^{13}+3060x^{4}y^{14}+816x^{3}y^{15}+153x^{2}y^{16}+18xy^{17}+y^{18}+43758y^{8}x^{10}+31824y^{7}x^{11}+18564y^{6}x^{12}+8568y^{5}x^{13}+3060y^{4}x^{14}+816y^{3}x^{15}+153y^{2}x^{16}+18yx^{17}+48620\left(xy\right)^{9}
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