- #1
brobertson89
- 12
- 0
So I have a control systems mid-semester exam coming up and the lecturer has posted up a formula sheet for us. However it is different to past years exams and has a geometry section with the following equations:
e^(±jθ)=cos(θ)±jsin(θ)
cos(θ)=(e^jθ+e^-jθ)/2
sin(θ)=(e^jθ-e^-jθ)/2j
Now I've seen these equations once before, however not in this course. In fact I have gone over every lecture, every tutorial, every practical and even the textbook looking for where these equations might be used and I can't find anything. So I was just wondering if anyone has any ideas on what I should be ready for.
Cheers,
Brandon
e^(±jθ)=cos(θ)±jsin(θ)
cos(θ)=(e^jθ+e^-jθ)/2
sin(θ)=(e^jθ-e^-jθ)/2j
Now I've seen these equations once before, however not in this course. In fact I have gone over every lecture, every tutorial, every practical and even the textbook looking for where these equations might be used and I can't find anything. So I was just wondering if anyone has any ideas on what I should be ready for.
Cheers,
Brandon