• A. $a^2+b^2$
• B. $a^2-b^2$
• C. ${\left(a+b\right)}^2+{\left(a-b\right)}^2$
• D. $\frac{{\left(a+b\right)}^2}{2}-\frac{{\left(a-b\right)}^2}{2}$

Answer: Option A

Explanation:

• A. -1
• B. 2a+1
• C. 1
• D. 2a-1

Answer: Option C

Explanation:

• A. $\left(-\alpha ,1\right)\cup \left(1,+\alpha \right)$
• B. $\left(-\alpha ,0\right)\cup \left(0,\alpha \right)$
• C. $\left(-\alpha ,\frac{1}{3}\right)\cup \left(\frac{1}{2},\alpha \right)$
• D. $\left(-\alpha ,\frac{1}{2}\right)\cup \left(\frac{1}{2},\alpha \right)$

Answer: Option D

Explanation:

• A. (0,-1), 11/23
• B. (2,1),$\left(\frac{-1}{2}\frac{-1}{4}\right)$
• C. (1/2 1/3), (-2,-1)
• D. (2,1),$\left(\frac{-1}{4}\frac{1}{2}\right)$

Answer: Option B

Explanation:

• A. 2/13, 6/13
• B. 3/13, 7/13
• C. 1/13, 5/13
• D. 4/13, 9/13

Answer: Option C

Explanation:

• A. (২,৪)
• B. (৪,-১)
• C. (১,১)
• D. (০,-২)

Answer: Option C

Explanation:

• A. Parabola
• B. Ellipse
• C. circle
• D. hyperola

Answer: Option B

Explanation:

• A. 6
• B. 1
• C. $\frac{11}{6}$
• D. -1

Answer: Option B

Explanation:

• A. (1,0,0), (0,1,0) (0,0,1)
• B. (1,2,3) (0,1,2) (1,0,0)
• C. (1,2,3) (1,0,0), (0,1,0) (0,0,1)
• D. (2,3,5), (3,4,5), (0,1,0)

Answer: Option A

Explanation:

• A. AB Not = BA
• B. AB = BA
• C. AB =-BA
• D. BA=B

Answer: Option A

Explanation:

• A. $\frac{d^{3}y}{d{x}^3}=0$
• B. $\frac{d^{2}y}{d{x}^2}+2a=0$
• C. $\frac{dy}{dx}+2ax-b=0$
• D. $\frac{d^{3}y}{d{x}^2}+\frac{d^{2}y}{d{x}^2}+\frac{dy}{dx}-2ay=0$

Answer: Option C

Explanation:

• A. $\frac{1}{2}\frac{7x^2}{2\log e7}+c$
• B. $\frac{1}{2}\frac{7x^2}{2\log e7}+c$
• C. $\frac{7x^2}{\log 7^c}+c$
• D. Try your self

Answer: Option D

Explanation:

• A. $f"\left(2\right)<0$
• B. $f"\left(2\right)>0$
• C. $f"\left(2\right)=0$
• D. $f\text{'}\left(2\right)=0$

Answer: Option B

Explanation:

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

Answer: Option D

Explanation:

• A. $8:3$
• B. $5:6$
• C. $3:8$
• D. $6:4$

Answer: Option A

Explanation: