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Find the adjoint and inverse of each of ...

Find the adjoint and inverse of each of the following matrices :
A = `[(a+ib, c +id),(-c + id,a - ib)]` where `a^(2) + b^(2) + c^(2) + d^(2) = 1`

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The correct Answer is:
`[(-14,3,16),(10,-1,-8),(-2,1,0)] and [(-(7)/(4),(3)/(8),2),((5)/(4),(-1)/(8),-1),((-1)/(4),(1)/(8),0)]`
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CHHAYA PUBLICATION-ADJOINT AND INVERSE OF A MATRIX AND SOLUTION OF LINEAR SIMULTANEOUS EQUATIONS BY MATRIX METHOD-LONG ANSWER TYPE QUESTIONS
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  20. If A=[(1,0,0),(0,1,0),(0,0,1)] then A^2+2A=

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