• 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. 1
• B. 2
• C. -1
• D. -2

Answer: Option B

Explanation:

• A. $x\le 3$
• B. $x\ge 2$
• C. $2\le x\le 11$
• D. $2\le x\le 3$

Answer: Option C

Explanation:

• A. R
• B. $\left(3,\infty \right)$
• C. $\left(-\infty .3\right)$
• D. $R-\left\{3\right\}$

Answer: Option A

Explanation:

• A. $\left(-\infty ,0\right)$
• B. $\left(-1,1\right)$
• C. $\left(0,\infty \right)$
• D. $\left(-1,\infty \right)$

Answer: Option B

Explanation:

• A. -1
• B. $\frac{1}{2}$
• C. −2
• D. 2

Answer: Option D

Explanation:

• A. $\theta \frac{1}{2}{\cos }^{-1}\left(\frac{5}{\sqrt{34}}\right)$
• B. $\theta \frac{1}{2}{\cos }^{-1}\left(\frac{3}{\sqrt{34}}\right)$
• C. $\theta \frac{1}{2}{\cos }^{-1}\left(\frac{10}{\sqrt{34}}\right)$
• D. $\theta \frac{1}{2}{\cos }^{-1}\left(\frac{3}{\sqrt{34}}\right)$

Answer: Option B

Explanation:

• A. $\frac{1}{b}-\frac{1}{a}$
• B. $\frac{1}{a}-\frac{1}{b}$
• C. $\frac{1}{a}+\frac{1}{b}$
• D. $-\frac{1}{a}-\frac{1}{b}$

Answer: Option A

Explanation:

• A. $\frac{\mathrm{\pi }}{2}$
• B. $\frac{\mathrm{\pi }}{3}$
• C. $\frac{\mathrm{\pi }}{4}$
• D. $\frac{\mathrm{\pi }}{6}$

Answer: Option B

Explanation:

• A. $\frac{5}{12}$
• B. $\frac{25}{144}$
• C. $\frac{13}{12}$
• D. $\pm \frac{13}{12}$

Answer: Option A

Explanation: