The function is $\"\"$ .

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Re-write the expression.

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$\"\"$

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$\"\"$ (Since $\"\"$ )

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$\"\"$

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$\"\"$

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$\"\"$

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Re-write the expression.

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$\"\"$

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$\"\"$

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Cancel the common terms.

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$\"\"$

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$\"\"$

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Multiply and divide the first term with 3.

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$\"\"$

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$\"\"$ .

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Therefore $\"\"$ .