1. A
   $\frac{c-b}{a-c}$
2. B
   $\frac{a-c}{c-b}$
3. C
   $\frac{c-a}{c-b}$
4. D
   $\frac{c-b}{c-a}$

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1. A
   $\sin^2 y$
2. B
   $\cos^2 y$
3. C
   $\tan^2 y$
4. D
   $\cot^2 y$

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1. A
   $\frac{(b-c)(b-d)}{(a-d)(a-c)}$
2. B
   $\frac{(a-d)(c-a)}{(b-c)(d-b)}$
3. C
   $\frac{(d-a)(c-a)}{(b-c)(d-b)}$
4. D
   $\frac{(b-c)(b-d)}{(c-a)(a-d)}$

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1. A
   $\frac{t_1}{t_3}$
2. B
   $\frac{t_3}{t_5}$
3. C
   $\frac{t_5}{t_7}$
4. D
   $\frac{t_1}{t_7}$

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

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1. A
   1
2. B
   $\frac{1}{4}$
3. C
   $\frac{1}{16}$
4. D
   $\frac{1}{32}$

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

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

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1. A
   $\sqrt{3}\cos 1°+\sin 1°$
2. B
   $\sqrt{3}\cos 1°-\frac{1}{2}\sin 1°$
3. C
   $\frac{1}{\sqrt{2}}(\sqrt{3}\cos 1°-\sin 1°)$
4. D
   $\dfrac{1}{\sqrt{2}}(\sqrt{3}\cos 1^\circ+\sin 1^\circ)$

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