A + A^-1 or A - A^-1 for a 2x2 matrix

1. A.
   $2$
2. B.
   $2\sqrt{2}$
3. C.
   $4$
4. D.
   $1$

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1. A.
   $\dfrac{2\pi}{3}$
2. B.
   $\dfrac{3\pi}{4}$
3. C.
   $\dfrac{5\pi}{6}$
4. D.
   $\pi$

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1. A.
   $\begin{bmatrix} -9 & 6 \\ -10 & 9 \end{bmatrix}$
2. B.
   $\begin{bmatrix} 9 & -6 \\ 10 & -9 \end{bmatrix}$
3. C.
   $\begin{bmatrix} -9 & 10 \\ -6 & 9 \end{bmatrix}$
4. D.
   $\begin{bmatrix} 9 & -10 \\ 6 & -9 \end{bmatrix}$

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1. A.
   $\begin{bmatrix} 2 & -3 \\ 5 & -7 \end{bmatrix}$
2. B.
   $\begin{bmatrix} -7 & 3 \\ -5 & 2 \end{bmatrix}$
3. C.
   $\begin{bmatrix} -5 & 0 \\ 0 & -5 \end{bmatrix}$
4. D.
   $\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$

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