Question Id : 12313 |
Context : JEE Main 6 September 2020 (Evening)
Let $\theta = {\pi \over 5}$ and $A = \left[ {\matrix{ {\cos \theta } & {\sin \theta } \cr { - \sin \theta } & {\cos \theta } \cr } } \right]$. If B = A + A4, then det (B) :
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