Write the Complex Number in the Form a + Bi $$\left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$$

question 118

Multiple Choice

Write the complex number in the form a + bi.
- $$\left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$$

• A) 7
• B) \(7 \mathrm { i }\)
• C) \(- 7\)
• D) \(- 7 i\)