Day 380: NDA Maths

1. A.
   $\cos 2\theta$
2. B.
   $\tan 2\theta$
3. C.
   $\sin 2\theta$
4. D.
   $\csc 2\theta$

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1. A.
   A is hermitian
2. B.
   A is skew-hermitian
3. C.
   $(\bar{A})^T + A$ is hermitian
4. D.
   $(\bar{A})^T + A$ is skew-hermitian

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1. A.
   $\dfrac{1}{17}$
2. B.
   $\dfrac{3}{17}$
3. C.
   $\dfrac{5}{17}$
4. D.
   $\dfrac{7}{17}$

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1. A.
   0
2. B.
   1
3. C.
   -1
4. D.
   $\frac{1}{2}$

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1. A.
   $\begin{pmatrix}ax+hy+gz \\ y \\ z\end{pmatrix}$
2. B.
   $\begin{pmatrix}ax+hy+gz \\ hx+by+fz \\ z\end{pmatrix}$
3. C.
   $\begin{pmatrix}ax+hy+gz \\ hx+by+fz \\ gx+fy+cz\end{pmatrix}$
4. D.
   [ax+hy+gz hx+by+fz gx+fy+cz]

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