A community for students.
Here's the question you clicked on:
 0 viewing
Kweku
 3 years ago
write 3(cos225 +isin225) in the form a + ib.
Kweku
 3 years ago
write 3(cos225 +isin225) in the form a + ib.

This Question is Closed

ZeHanz
 3 years ago
Best ResponseYou've already chosen the best response.0225 degrees rings a bell, no?

ZeHanz
 3 years ago
Best ResponseYou've already chosen the best response.0Not yet ;) I meant that sin225 and cos225 are supposed to be wellknown numbers: they have to do with the 454590 degree triangle, with sides a, a and a√2. Does that ring a bell? See image. Both sin225 and cos225 are: \[\frac{ 1 }{ 2 }\sqrt{2}\]

Kweku
 3 years ago
Best ResponseYou've already chosen the best response.0you mean right angled triangle?

Kweku
 3 years ago
Best ResponseYou've already chosen the best response.0so you mean the angles should be in the first quadrant?

ZeHanz
 3 years ago
Best ResponseYou've already chosen the best response.0No, 225 is in the third quadrant. I only meant that in the 3rd quadrant you get the same values (just negative) as in the triangle with 454590 degrees.

ZeHanz
 3 years ago
Best ResponseYou've already chosen the best response.0Therefore you now have \[3(\frac{ 1 }{ 2 }\sqrt2+i \cdot \frac{ 1 }{ 2 }\sqrt 2)\]And if you work out the brackets you're done.

Kweku
 3 years ago
Best ResponseYou've already chosen the best response.0Yeah I get you but that does not make any change.

ZeHanz
 3 years ago
Best ResponseYou've already chosen the best response.0Is your problem solved then?
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.