Step 1 :

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The function is $\"\"$

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The area A under a function $\"\"$ on $\"\"$ :

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$\"\"$

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Where $\"\"$ and $\"\"$

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Here, $\"\"$ and $\"\"$

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$\"\"$

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$\"\"$

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Substitute these values in A.

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$\"\"$

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The area under the graph f :

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$\"\"$

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Solution :

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$\"\"$