$\"\"$

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(a)

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The expression is $\"\"$ .

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Consider $\"\"$

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$\"\"$ .

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$\"\"$

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Apply L $\"\"$ Hopital $\"\"$ s Rule.

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L $\"\"$ Hopital $\"\"$ s Rule: If $\"\"$ or $\"\"$ then $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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Graph :

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Graph of the function $\"\"$ .

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$\"\"$

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Observe the graph:

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The graph appears to be Horizontal tangent line at origin.

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Slope of the Horizontal tangent is zero.

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Hence $\"\"$ .

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$\"\"$

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Graph of the function $\"\"$ is

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$\"\"$

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$\"\"$ .