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यदि A = $\left[\begin{array}{ll} 6 & 9 \\ 2 & 3 \end{array}\right]$ तथा B = $\left[\begin{array}{lll} 2 & 6 & 0 \\ 7 & 9 & 8 \end{array}\right] $ है तो AB ज्ञात कीजिए।
X तथा Y, ज्ञात कीजिए, यदि X + Y = $ \left[\begin{array}{ll} 5 & 2 \\ 0 & 9 \end{array}\right] $ तथा X - Y =$ \left[\begin{array}{cc} 3 & 6 \\ 0 & -1 \end{array}\right] $ है।
परिकलित कीजिए: $\left[\begin{array}{ll} a^{2}+b^{2} & b^{2}+c^{2} \\ a^{2}+c^{2} & a^{2}+b^{2} \end{array}\right] + \left[\begin{array}{cc} 2 a b & 2 b c \\ -2 a c & -2 a b \end{array}\right]$