$\"\"$

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Binomial theorem :

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Let $\"\"$ and $\"\"$ be a real numbers.

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For any positive integer $\"\"$ ,

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$\"\"$

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$\"\"$ .

\

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$\"\"$

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The expression is $\"\"$ .

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Where $\"\"$ , $\"\"$ and $\"\"$ .

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By using binomial theorem,

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .