$\"\"$

\

$\"\"$

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Consider $\"\"$ and $\"\"$ for all $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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From the results of $\"\"$ and $\"\"$ ,

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$\"\"$

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Divide on each side with $\"\"$ .

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$\"\"$

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Divide on each side with $\"\"$ .

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$\"\"$ .

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$\"\"$

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(b)

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Consider $\"\"$ is true for $\"\"$ .

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Comparison property of integrals:

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If $\"\"$ for $\"\"$ , then $\"\"$ .

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Therefore,

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .