$\"\"$

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The maximum vaue of function $\"\"$ on set of all real numbers are satisfies the $\"\"$ .

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The function is $\"\"$ .

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Let $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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

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Substitute $\"\"$ .

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$\"\"$ and $\"\"$ .

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$\"\"$ .

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$\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ and $\"\"$ and $\"\"$ .

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At $\"\"$

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$\"\"$

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$\"\"$

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The function $\"\"$ is maximum and $\"\"$ is minimum.

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At $\"\"$

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$\"\"$

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$\"\"$

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The function $\"\"$ is maximum and $\"\"$ is minimum.

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$\"\"$

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The function $\"\"$ is maximum and $\"\"$ is minimum in the interval $\"\"$ .

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The function $\"\"$ is maximum and $\"\"$ is minimum in the interval $\"\"$ .