• A. $\frac{\pi }{4}$
• B. $\frac{5\pi }{3}$
• C. $\frac{\pi }{6}$
• D. $\frac{\pi }{3}$

Answer: Option D

Explanation:

• A. $\pm \frac{\sqrt{5}}{3}$
• B. $\frac{\sqrt{5}}{3}$
• C. $-\frac{\sqrt{5}}{3}$
• D. $\frac{5}{3}$

Answer: Option A

Explanation:

• A. $x$
• B. $2x$
• C. $3x$
• D. $4x$

Answer: Option A

Explanation:

• A. $0$
• B. $x$
• C. $\frac{1}{x}$
• D. $1$

Answer: Option B

Explanation:

• A. $-1$
• B. $1$
• C. $2$
• D. $-2$

Answer: Option C

Explanation:

• A. $2\mathrm{\pi }$
• B. $4\mathrm{\pi }$
• C. $\frac{\mathrm{\pi }}{2}$
• D. $\frac{\mathrm{\pi }}{2}-\frac{1}{4}$

Answer: Option C

Explanation:

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

Answer: Option C

Explanation:

• A. π/6
• B. π/4
• C. π/3
• D. π/2

Answer: Option B

Explanation:

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

Answer: Option A

Explanation:

• A. $\frac{\sqrt{5}}{4}$
• B. $\frac{5}{4}$
• C. $\frac{4}{5}$
• D. $\frac{\sqrt{3}}{4}$

Answer: Option C

Explanation:

• A. -1
• C. -cos a
• D. $\sqrt{3}\sin a$

Answer: Option B

Explanation:

• A. 1/2
• B. 1/3
• C. -1
• D. 1

Answer: Option D

Explanation:

• A. $\frac{5}{12}$
• B. $\frac{12}{5}$
• C. $-\frac{5}{12}$
• D. $-\frac{12}{5}$

Answer: Option A

Explanation:

• A. $7$
• B. $\frac{1}{7}$
• C. $\frac{3}{7}$
• D. $-7$

Answer: Option A

Explanation:

• A. $\sqrt{2}$
• B. $-\sqrt{2}$
• C. $\frac{2}{\sqrt{3}}$
• D. $-\frac{\sqrt{3}}{2}$

Answer: Option B

Explanation: