$\"\"$

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The function is $\"\"$ . $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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As $\"\"$ tends to $\"\"$ , $\"\"$ tends to $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The function is $\"\"$ .

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$\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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The function $\"\"$ has extreme value.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$ .

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The function $\"\"$ has minimum value at $\"\"$ .

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$\"\"$

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Graph :

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Graph of $\"\"$ is:

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$\"\"$

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Observe the figure :

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As the value of $\"\"$ increases , the function $\"\"$ is decreasing and minimum point is moving down.

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$\"\"$

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The function $\"\"$ has minimum value at $\"\"$ .

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$\"\"$

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As the value of $\"\"$ increases , the function $\"\"$ is decreasing and minimum point is moving down.