JEE Math Practice Question
Let $$\theta = {\pi \over 5}$$ and $$A = \left[ {\begin{matrix} {\cos \theta } & {\sin \theta } \\ { - \sin \theta } & {\cos \theta } \\ \end{matrix} } \right]$$. If B = A + A4 , then det (B) :
- A.lies in (1, 2)
- B.lies in (2, 3).
- C.is zero.
- D.is one.
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