Day 238: NDA Maths

1. A.
   2
2. B.
   4
3. C.
   6
4. D.
   8

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1. A.
   $\tan^{-1}\!\left(\dfrac{1}{2\sqrt{6}}\right)$
2. B.
   $\tan^{-1}\!\left(\dfrac{1}{\sqrt{2}}\right)$
3. C.
   $\tan^{-1}(3)$
4. D.
   $\tan^{-1}\!\left(\dfrac{1}{\sqrt{3}}\right)$

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1. A.
   $\det(B)$
2. B.
   $\det(A)$
3. C.
   $\det(B^{-1})$
4. D.
   $\det(A^{-1})$

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1. A.
   5
2. B.
   10
3. C.
   15
4. D.
   45

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1. A.
   $\pm 1$
2. B.
   $\pm 2$
3. C.
   $\pm 3$
4. D.
   $\pm 5$

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