Evaluate
\left(x+2\right)^{20}+\left(x-2\right)^{20}
Expand
2x^{20}+1520x^{18}+155040x^{16}+4961280x^{14}+64496640x^{12}+378380288x^{10}+1031946240x^{8}+1270087680x^{6}+635043840x^{4}+99614720x^{2}+2097152
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