- #1
RoughRoad
- 63
- 0
In a complex number sum, I have encountered a minute difficulty in understanding a step:
[itex]\left|(cos\theta-1)+i.sin\theta\right|[/itex]
= [itex]\sqrt{}(cos\theta-1)^2+sin^2\theta[/itex]
Now my question is, how did the 'i' got eliminated from the second step? Now, i equals [itex]\sqrt{}-1[/itex], so when squared, there should be a minus sign in the second step. Can anyone help me clearing my basics?
[itex]\left|(cos\theta-1)+i.sin\theta\right|[/itex]
= [itex]\sqrt{}(cos\theta-1)^2+sin^2\theta[/itex]
Now my question is, how did the 'i' got eliminated from the second step? Now, i equals [itex]\sqrt{}-1[/itex], so when squared, there should be a minus sign in the second step. Can anyone help me clearing my basics?