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3 and 4 .Determinants and Matrices
easy
यदि $\omega $ इकाई का घनमूल हो व $\Delta = \left| {\begin{array}{*{20}{c}}1&{2\omega }\\\omega &{{\omega ^2}}\end{array}} \right|$, तो ${\Delta ^2}$ =
A
$ - \omega $
B
$\omega $
C
$1$
D
${\omega ^2}$
Solution
(b) $\Delta = {\omega ^2} – 2{\omega ^2} = – {\omega ^2}$.
Therefore ${\Delta ^2} = {\omega ^4} = \omega $.
Standard 12
Mathematics