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

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If $\"\"$ and $\"\"$ are inverse matrices then $\"\"$ .

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Find $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Find $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Hence $\"\"$ .

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Thus $\"\"$ and $\"\"$ are inverses.

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