If a,b,c and d are real numbers such that a2+b2+c2+d2=1 and if A=[a+ib – InterviewSolution

1.	If a,b,c and d are real numbers such that a2+b2+c2+d2=1 and if A=[a+ibc+id−c+ida−ib],where i2=−1, then A−1=
Answer» If $a, b, c$ and $d$ are real numbers such that $a^{2} + b^{2} + c^{2} + d^{2} = 1$ and if $A = [\begin{matrix} a + i b & c + i d - c + i d & a - i b \end{matrix}],$ where $i^{2} = - 1,$ then $A^{- 1} =$

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