$\"\"$

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The function is $\"\"$ .

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(a)

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Graph of the function $\"\"$ :

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$\"\"$

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$\"\"$

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(b)

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Symmetry:

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Observe the graph of $\"\"$ .

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Because of the function is symmetrical with respect to the origin, $\"\"$ is an odd function.

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(c)

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Periodicity:

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Periodic in $\"\"$ with period $\"\"$ .

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$\"\"$

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(d)

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Extreema:

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Locate the extreema on $\"\"$ .

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$\"\"$

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The extrema points are $\"\"$ and $\"\"$ .

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(e)

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Concavity:

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Concavity down in $\"\"$ .

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$\"\"$

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(a) Graph of the function $\"\"$ :

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$\"\"$

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(b) The function is symmetrical with respect to the origin.

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(c) Periodic in $\"\"$ with period $\"\"$ .

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(d) The extrema points are $\"\"$ and $\"\"$ on the interval $\"\"$ .

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(e) Concavity down in $\"\"$ .