\"\"

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Binomial theorem :

\

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\"\"

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\"\"

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The expression is \"\".

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Consider the term \"\".

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\"\"

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\"\"

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\"\"

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\"\"

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\"\".

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Substitute \"\" in \"\".

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\"\".

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\"\".

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Therefore, the expansion of \"\" is \"\".

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\"\"

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The expansion of \"\" is \"\".