• 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:

• A. $x^2+y^2=1$
• B. $\frac{1}{x^2}+\frac{1}{y^2}=1$
• C. $\frac{1}{x} + \frac{1}{y}= \frac{x}{2}$
• D. $x + y = \frac{x}{2}$

Answer: Option B

Explanation:

• A. $x^2+y^2=1$
• B. $\frac{1}{x^2}+\frac{1}{y^2}=1$
• C. $\frac{1}{x}+\frac{1}{y}=\frac{\mathrm{\pi }}{2}$
• D. $x+y=\frac{\mathrm{\pi }}{2}$

Answer: Option B

Explanation:

• A. 8
• B. 6
• C. 4
• D. 3

Answer: Option A

Explanation:

• A. $p=\frac{9}{16}$
• B. $p<\frac{16}{9}$
• C. $p<\frac{9}{16}$
• D. $p>\frac{9}{16}$

Answer: Option C

Explanation:

• A. 60°
• B. 90°
• C. 120°
• D. 150°

Answer: Option D

Explanation:

• A. 3
• B. 4
• C. 12
• D. 9

Answer: Option B

Explanation:

• A. $1$
• B. $-i$
• C. $i$
• D. $0$

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: