# How do you write the trigonometric form in complex form #2(cos(pi/2+isin(pi/2))#?

##### 1 Answer

Aug 31, 2016

#### Explanation:

The first step is to evaluate the trigonometric part.

#color(orange)"Reminder " color(red)(|bar(ul(color(white)(a/a)color(black)(cos(pi/2)=0" and " sin(pi/2)=1)color(white)(a/a)|)))#

#rArrcos(pi/2)+isin(pi/2)=0+i#

#rArr2(cos(pi/2)+isin(pi/2))=2(0+i)=2i#