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Find the inverse of each of the matrices...

Find the inverse of each of the matrices (if it exists )
` {:[( 1,0,0),( 0 ,cos alpha , sin alpha ),( 0, sin alpha , -cos alpha ) ]:} `

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The correct Answer is:
` {:(1,0,0),(0,cos alpha , sin alpha ),(0, sin alpha ,-cos alpha ):}`
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