$\"\"$ \ \

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The member of the family of the function is $\"\"$ . \ \

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Find for which members is $\"\"$ largest. \ \

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The curvature of the plane at $\"\"$ is $\"\"$ . \ \

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Consider $\"\"$ . \ \

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

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$\"\"$ \ \

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$\"\"$ . \ \

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Substitute the corresponding values in $\"\"$ . \ \

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$\"\"$ \ \

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$\"\"$ \ \

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Substitute $\"\"$ . \ \

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$\"\"$ \ \

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$\"\"$ . \ \

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$\"\"$ \ \

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Consider $\"\"$ . \ \

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

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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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Find the critical numbers equate $\"\"$ . \ \

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$\"\"$ \ \

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$\"\"$ \ \

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$\"\"$ . \ \

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$\"\"$ \ \

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$\"\"$ \ \

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Substitute $\"\"$ values in $\"\"$ . \ \

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If $\"\"$ , then $\"\"$ is positive. \ \

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If $\"\"$ , then $\"\"$ is negative. \ \

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If $\"\"$ , then $\"\"$ is positive. \ \

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If $\"\"$ , then $\"\"$ is negative. \ \

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The value of $\"\"$ is largest for $\"\"$ . \ \

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Therefore, the function is $\"\"$ and $\"\"$ . \ \

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$\"\"$ \ \

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