1. A
   288
2. B
   576
3. C
   1152
4. D
   2304

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1. A
   5760
2. B
   2880
3. C
   1440
4. D
   720

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1. A
   0
2. B
   1
3. C
   $\Delta$
4. D
   $-\Delta$

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1. A
   0
2. B
   1
3. C
   $\Delta$
4. D
   $-\Delta$

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1. A
   0
2. B
   1
3. C
   $\Delta$
4. D
   $-\Delta$

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1. A
   8
2. B
   9
3. C
   10
4. D
   11

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1. A
   341
2. B
   682
3. C
   1023
4. D
   1364

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1. A
   1365
2. B
   2730
3. C
   4024
4. D
   5460

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1. A
   $30-4x$
2. B
   $35-7x$
3. C
   $40-7x$
4. D
   $45-5x$

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1. A
   $30-6x$
2. B
   $35-6x$
3. C
   $40-5x$
4. D
   $40-6x$

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1. A
   $21x-40$
2. B
   $21x-35$
3. C
   $20x-35$
4. D
   $20x-25$

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1. A
   $\begin{pmatrix} 0 & 1/2 & 1/2 \\ 1/2 & 0 & 1/2 \\ 1/2 & 1/2 & 0 \end{pmatrix}$
2. B
   $\begin{pmatrix} 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{pmatrix}$
3. C
   $\cos2\theta \begin{pmatrix} 0 & -1 & 1 \\ 1 & 0 & -1 \\ -1 & 1 & 0 \end{pmatrix}$
4. D
   $\cos2\theta \begin{pmatrix} 0 & -1/2 & 1/2 \\ 1/2 & 0 & -1/2 \\ -1/2 & 1/2 & 0 \end{pmatrix}$

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1. A
   $\begin{pmatrix} 0 & 1/2 & 1/2 \\ 1/2 & 0 & 1/2 \\ 1/2 & 1/2 & 0 \end{pmatrix}$
2. B
   $\begin{pmatrix} 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{pmatrix}$
3. C
   $\cos2\theta \begin{pmatrix} 0 & -1 & 1 \\ 1 & 0 & -1 \\ -1 & 1 & 0 \end{pmatrix}$
4. D
   $\cos2\theta \begin{pmatrix} 0 & -1/2 & 1/2 \\ 1/2 & 0 & -1/2 \\ -1/2 & 1/2 & 0 \end{pmatrix}$

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

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1. A
   6 m
2. B
   7 m
3. C
   8 m
4. D
   9 m

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1. A
   $17$ m
2. B
   $\frac{50}{3}$ m
3. C
   $\frac{40}{3}$ m
4. D
   $16$ m

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1. A
   1
2. B
   $\frac{41}{25}$
3. C
   $\frac{37}{25}$
4. D
   $\frac{33}{25}$

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1. A
   $\frac{x-y}{2\sqrt{3}}$
2. B
   $\frac{x-y}{4\sqrt{3}}$
3. C
   $\frac{x-y}{4}$
4. D
   $\frac{x-y}{2}$

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1. A
   $2+\frac{\sqrt{3}(x-y)}{x+y}$
2. B
   $2-\frac{\sqrt{3}(x-y)}{x+y}$
3. C
   $2+\frac{\sqrt{3}(x+y)}{x-y}$
4. D
   $2-\frac{\sqrt{3}(x+y)}{x-y}$

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1. A
   $\frac{x-y}{2\sqrt{3}}\sqrt{1+\left\{2+\frac{\sqrt{3}(x+y)}{x-y}\right\}^2}$
2. B
   $\frac{x-y}{2\sqrt{3}}\sqrt{1+\left\{2-\frac{\sqrt{3}(x+y)}{x-y}\right\}^2}$
3. C
   $\frac{x-y}{4\sqrt{3}}\sqrt{1+\left\{2+\frac{\sqrt{3}(x+y)}{x-y}\right\}^2}$
4. D
   $\frac{x-y}{4\sqrt{3}}\sqrt{1+\left\{2-\frac{\sqrt{3}(x+y)}{x-y}\right\}^2}$

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