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[" 50.A matrix "X" has "(a+b)" rows and "(a+2)" columns.While the matrix "X" has "(b+1)],[" rows and "(a+3)" columns.Both matrix "XY&YX" exist.Find a and "b" ; "],[" 51.If "cos^(-1)x+cos^(-1)y+cos^(-1)z=3 pi," then "xy+yz+zx=0]

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