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Without using the concept of inverse of a matrix, find the matrix `[x y z u]` such that `[(5,-7),(-2 ,3)][(x ,y),( z, u)]=[(-16,-6 ),(7, 2)]` .

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RD SHARMA ENGLISH-ALGEBRA OF MATRICES-All Questions
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  11. If P(x)=[cosxsinx-sinxcosx] , then show that P(x)P(y)=P(x+y) .

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