Given function is $\"\"$

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Derivative it with

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Again L.C.M for numerators

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$\"\"$

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cancelling the powers

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$\"\"$

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Multiplying with 12

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$\"\"$

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Substract the common terms

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$\"\"$

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Take out 4 common

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$\"\"$