$\"\"$

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The function is $\"\"$ .

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Apply derivative with respect to $\"\"$ .

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$\"\"$

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Product rule of derivative : $\"\"$ .

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Derivative formulae : $\"\"$ and $\"\"$ .

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$\"\"$

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To find the relative extrema of the function equate $\"\"$ to zero.

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$\"\"$

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

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$\"\"$ can never be zero.

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$\"\"$ .

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

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$\"\"$

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The critical point is $\"\"$ .

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$\"\"$

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Determine the relative extrema, using second derivative test.

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$\"\"$

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Differentiate with respect to $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in the above equation.

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$\"\"$

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By the second derivative test, the function has a relative minimum at $\"\"$ .

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$\"\"$

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Relative minimum : $\"\"$ .