A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing

This Question is Closed

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0Please don't just go sin 54 = blah and cos(72) = blah, so blah + blah = blahblah

tukajo
 2 years ago
Best ResponseYou've already chosen the best response.0is 54 the actual number or is that in 54 degrees?

zzr0ck3r
 2 years ago
Best ResponseYou've already chosen the best response.0So you just want to know how to computte this by hand?

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0why did you go into radians?

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0so what is x equal to?

tukajo
 2 years ago
Best ResponseYou've already chosen the best response.0I fluttered that up ignore me.

tukajo
 2 years ago
Best ResponseYou've already chosen the best response.0Hopefully zrocker can help you X_X

Callisto
 2 years ago
Best ResponseYou've already chosen the best response.3\[sin^2(54)+cos^2(72)\]\[=(cos(9054))^2+cos^2(72)\]\[=cos^2(36)+cos^2(72)\] That looks nicer

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0Oh, wait... let me try now

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0cos^2(36) + (2cos^2(36)1)^2

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0now... do we evaluate cos(36) or simplify more?

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0ok. is this straightforward or something we fancily work out?

Callisto
 2 years ago
Best ResponseYou've already chosen the best response.3let x = 36 5x = 180 3x = 180  2x sin 3x = sin2x 3 sinx  4sin^3 x = 2sinx cox Since sinx =/= 0 3 4 sin^2 x = 2cosx 3 4 ( 1cos^2 x) = 2 cos x 4 cos^2 x  2cosx 1 =0 Now, solve for cosx.

Callisto
 2 years ago
Best ResponseYou've already chosen the best response.3@apple_pi Come back :'(

zzr0ck3r
 2 years ago
Best ResponseYou've already chosen the best response.0So in what class do we learn to play with this trick?

Callisto
 2 years ago
Best ResponseYou've already chosen the best response.3I'm sorry, I don't know. I'm not from the US. But for me, I learnt it two years before university.

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0Sorry... I had to go for a while

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0Yeah that solved it! Thanks @Callisto

Callisto
 2 years ago
Best ResponseYou've already chosen the best response.3You're welcome. FYI, this post is worth looking! http://openstudy.com/study#/updates/4fe6e718e4b02c91101b52cd

apple_pi
 2 years ago
Best ResponseYou've already chosen the best response.0Got another one: http://openstudy.com/study#/updates/50827553e4b0dab2a5ebddaa
Ask your own question
Ask a QuestionFind 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.