I can't see how they did this operation.

http://img824.imageshack.us/img824/1111/simpr.png

thx for the help.

Printable View

- Jan 28th 2011, 03:01 PMkonvosI don't get this simplification
I can't see how they did this operation.

http://img824.imageshack.us/img824/1111/simpr.png

thx for the help. - Jan 28th 2011, 03:09 PMpickslides
Looks like simple trig identities to me i.e.

- Jan 28th 2011, 03:09 PMArchie Meade
- Jan 28th 2011, 03:11 PMHoudini
Ok..1.sin2(x) + cos2(x) = 1=>sin2(x)=1+cos2(x)....but you have - in front of sin so you can see why -1+cos2(x)

2.sin(2x) = 2 sin x cos x

from 1 and 2 =>-sin2(x) + cos2(x)+2 sin x cos x=-1+cos2(x)+sin(2x) - Jan 28th 2011, 03:23 PMkonvos
thx for the help everybody

I'd no idea of this identity http://www.mathhelpforum.com/math-he...2177745298.png

I suppose I should review trig... - Jan 28th 2011, 03:48 PMDefunkt

- Jan 28th 2011, 05:44 PMArchie Meade
- Jan 28th 2011, 06:59 PMmr fantastic