• 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. $\frac{\pi }{4}$
• 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. -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. 8
• B. 6
• C. 4
• D. 3

Answer: Option A

Explanation:

• A. 60°
• B. 90°
• C. 120°
• D. 150°

Answer: Option D

Explanation:

• A. $\left[\begin{array}{cc}5& 2\\ 3& 1\end{array}\right]$
• B. $\left[\begin{array}{cc}-5& -2\\ -3& -1\end{array}\right]$
• C. $\left[\begin{array}{cc}-5& 2\\ 3& -1\end{array}\right]$
• D. $\left[\begin{array}{cc}-1& 3\\ 5& -2\end{array}\right]$

Answer: Option B

Explanation:

• A. 1
• B. -1
• D. i

Answer: Option C

Explanation:

• A. i
• B. -i
• C. -1
• D. 1

Answer: Option A

Explanation:

• A. 17
• B. 16
• C. 27
• D. 29

Answer: Option D

Explanation:

• A. $c^{2x}+5+C$
• B. $e^{3x}+C$
• C. $e^{4x}+5+C$
• D. $\frac{1}{4}{e}^{4x}+C$

Answer: Option D

Explanation:

• A. 1
• B. 2
• C. -1
• D. -2

Answer: Option B

Explanation:

• A. $[0,3)$
• B. $[3,+\infty )$
• C. $(-\infty ,3 ]$
• D. $(-\infty ,+\infty ]$

Answer: Option C

Explanation: