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

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

apple_pi Group TitleBest ResponseYou've already chosen the best response.0
54 degrees
 2 years ago

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

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

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

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

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

Callisto Group TitleBest 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
 2 years ago

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

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

apple_pi Group TitleBest ResponseYou've already chosen the best response.0
am i right?
 2 years ago

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

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

Callisto Group TitleBest ResponseYou've already chosen the best response.3
very fancy :
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.3
let 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.
 2 years ago

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

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

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

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

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

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

apple_pi Group TitleBest ResponseYou've already chosen the best response.0
Got another one: http://openstudy.com/study#/updates/50827553e4b0dab2a5ebddaa
 2 years ago
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