• A. (1+a+b)(1-a+b)
• B. (1+a+b)(1-a-b)
• C. (1+a+b)(1+a-b)
• D. (1+a-b)(1-a+b)

Answer: Option D

Explanation:

• A. $\left(1+a-b\right)\left(1-a+b\right)$
• B. $\left(1+a+b\right)\left(1-a+b\right)$
• C. $\left(1+a+b\right)\left(1-a-b\right)$
• D. $\left(1-a+b\right)\left(1-a-b\right)$

Answer: Option A

Explanation:

• A. 60 ডিগ্রী
• B. 75ডিগ্রী
• C. 30ডিগ্রী
• D. 45ডিগ্রী

Answer: Option D

Explanation:

• A. $\frac{4}{5}$
• B. $\frac{1}{2}$
• C. $\frac{3}{8}$
• D. $\frac{5}{9}$

Answer: Option D

Explanation:

• 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. 80°
• B. 90°
• C. 100°
• D. 120°

Answer: Option B

Explanation:

• A. $30°$
• B. $60°$
• C. $80°$
• D. $90°$

Answer: Option D

Explanation:

• A. $a-b$
• B. $a+b$
• C. $12\left(a^2-b^2\right)$
• D. $2$

Answer: Option D

Explanation:

• A. $\frac{5}{2}$
• B. $\frac{1}{2}$
• C. $\frac{125}{2}$
• D. $\frac{25}{\sqrt{5}}$

Answer: Option A

Explanation:

• A. 659
• B. 694
• C. 841
• D. 859

Answer: Option C

Explanation:

• A. ${\left(a+b\right)}^2-{\left(a-b\right)}^2$
• B. ${\left(a-b\right)}^2-{\left(a+b\right)}^2$
• C. ${\left(a+b\right)}^2+{\left(a-b\right)}^2$
• D. ${\left(a+b\right)}^2-4ab$

Answer: Option C

Explanation:

• A. 31
• B. 26
• C. 52
• D. কোনটিই নয়

Answer: Option B

Explanation:

• A. $\frac{1}{\sqrt{3}}$
• B. $\frac{2}{\sqrt{3}}$
• C. $\sqrt{3}$
• D. 2

Answer: Option C

Explanation:

• A. $\frac{1}{9}$
• B. $\frac{1}{4}$
• C. $\frac{1}{16}$
• D. $\frac{1}{3}$

Answer: Option B

Explanation:

• A. $5/8$
• B. $7/8$
• C. $9/8$
• D. $11/8$

Answer: Option B

Explanation: