$\"\"$

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Consider $\"\"$ is an even function.

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From the definition of even function : $\"\"$ .

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The composite function is $\"\"$ .

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$\"\"$

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$\"\"$ ( Since $\"\"$ )

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$\"\"$

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$\"\"$ .

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So $\"\"$ is an even function.

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$\"\"$

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$\"\"$ is also an even function.