$\"\"$

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The values are $\"\"$ and $\"\"$ .

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Since $\"\"$ and $\"A$ ,

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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

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

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Cosnider $\"\"$ .

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$\"\"$

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$\"\"$ \ \

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

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$\"\"$

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