यदि $A = \left[ {\begin{array}{*{20}{c}}1&0&0\\0&1&0\\a&b&{ – 1}\end{array}} \right]$, तब ${A^2} = $

$X$ तथा $Y$ ज्ञात कीजिए यदि $Y =\left[\begin{array}{ll}3 & 2 \\ 1 & 4\end{array}\right]$ तथा $2 X + Y =\left[\begin{array}{rl}1 & 0 \\ -3 & 2\end{array}\right]$

यदि $$ A =\left[\begin{array}{ccc} e ^{ t } & e ^{- t } \cos t & e ^{- t } \sin t \\ e ^{ t } & – e ^{- t } \cos t – e ^{- t } \sin t & – e ^{- t } \sin t + e ^{- t } \cos t \\ e ^{ t } & 2 e ^{- t } \sin t & -2 e ^{- t } \cos t \end{array}\right] $$ है, तो $A$

यदि $A = [a\,\,b],B = [ – b{\rm{  }} – a]$ और $C = \left[ \begin{array}{l}\,\,\,\,a\\ – a\end{array} \right]$, तब सही कथन है

यदि $P = \left( {\begin{array}{*{20}{c}}i&0&{ – i}\\0&{ – i}&i\\{ – i}&i&0\end{array}} \right)$ और $Q = \left( {\begin{array}{*{20}{c}}{ – i}&i\\0&0\\i&{ – i}\end{array}} \right)$,तो $PQ$ का मान होगा