$\"\"$

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The function is $\"\"$ and the interval is $\"\"$ .

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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To find the critical numbers of $\"\"$ , equate $\"\"$ to zero.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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

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$\"\"$ is in the region $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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To find the absolute extreme of function in given region $\"\"$ , sketch the function .

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$\"\"$

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Critical point $\"\"$ is maximum point over the interval $\"\"$ .

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Left end point $\"\"$ is minimum point over the interval $\"\"$ .

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$\"\"$

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Minimum point is $\"\"$ .

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Maximum point is $\"\"$ .