• A. 2f(x)
• B. 4f(x)
• C. 3f(x)
• D. 4

Answer: Option C

Explanation:

• A. $x^2+1$
• B. $x^6+2x^3+1$
• C. $x^6+1$
• D. $4x^2-6x+1$

Answer: Option C

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:

• A. $\frac{1}{4\sqrt{x}\sqrt{1-\sqrt{x}}}$
• B. $\frac{-1}{2\sqrt{x}\sqrt{1-\sqrt{x}}}$
• C. $\frac{1}{2\sqrt{x}\sqrt{1-\sqrt{x}}}$
• D. $\frac{-1}{4\sqrt{x}\sqrt{1-\sqrt{x}}}$

Answer: Option D

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. $\left(-\infty , 0\right)$
• 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. $\frac{4}{3}$
• B. $\frac{3}{16}$
• C. $\frac{9}{4}$
• D. $\frac{3}{4}$

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. $\pm \frac{1}{5}$
• B. $\pm \frac{1}{2}$
• C. $\pm \frac{3}{2}$
• D. $\pm \frac{1}{3}$

Answer: Option D

Explanation: