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

tukajoBest ResponseYou've already chosen the best response.0
is 54 the actual number or is that in 54 degrees?
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
So you just want to know how to computte this by hand?
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
why did you go into radians?
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
so what is x equal to?
 one year ago

tukajoBest ResponseYou've already chosen the best response.0
I fluttered that up ignore me.
 one year ago

tukajoBest ResponseYou've already chosen the best response.0
Hopefully zrocker can help you X_X
 one year ago

CallistoBest 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
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
Oh, wait... let me try now
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
cos^2(36) + (2cos^2(36)1)^2
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
now... do we evaluate cos(36) or simplify more?
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
ok. is this straightforward or something we fancily work out?
 one year ago

CallistoBest 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.
 one year ago

CallistoBest ResponseYou've already chosen the best response.3
@apple_pi Come back :'(
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
So in what class do we learn to play with this trick?
 one year ago

CallistoBest 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.
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
Sorry... I had to go for a while
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
Yeah that solved it! Thanks @Callisto
 one year ago

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

apple_piBest ResponseYou've already chosen the best response.0
Got another one: http://openstudy.com/study#/updates/50827553e4b0dab2a5ebddaa
 one year ago
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