1 . 11+i

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

Answer: Option A

Explanation:

2 . 11+i

• A. $2x^2+2x+1=0$
• B. $x^2+1=0$
• C. $2x^2-2x+1=0$
• D. $4x^2-4x+1=0$

Answer: Option C

Explanation:

3 . 11+i

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

Answer: Option A

Explanation:

4 . i9+i10+i11+i12+i13=?

• A. $1$
• B. $-1$
• C. $i$
• D. $-i$

Answer: Option C

Explanation:

5 . 11+i

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

Answer: Option C

Explanation:

6 . 11+i

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

Answer: Option A

Explanation: