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there must be a method using the formulas

turing??

I am thinking....

(18*5)=90

so?

looking at some way to write this such that we can apply an identity to it...

http://answers.yahoo.com/question/index?qid=20061025091609AASJNUn

whoa!!

why is \[\sin(3x)=\cos(2x)\]?

Most of peoples are not smart....they are clever

use the power series expansion
\[\sin(x) = x/1! - x^3/3! + x^5/5! -x^7/7!.....\]

hw put valu 18>??

bt it goes on

if x= 18, 2x+3x=90

i liked this

2x=90-3x

cos both side

k

cos(2x)=sin(3x)

thx evryone

catch it?

gotchya, thx

campbell pls tell ur method