Cool Trigonometric Stuff

[ice_blockie]

Does anyone know any cool trig expressions/conversions/simplifications like this:



When I did a practice exam which involved this simplification, I had to stare at the question for like 20 minutes...

[ed_saifa]

Those questions always get me as well.

[Collin Li]

Did you mean at the beginning?

[Mao]

[xox.happy1.xox]

Is this on the formula sheet? I recall something similar to this from it (I will be relying on my formula sheet so much ).

[cara.mel]

Is this on the formula sheet? I recall something similar to this from it (I will be relying on my formula sheet so much ).

On the formula sheet you have 3 groups of things:
Fundamental one (sin x)^2 + (cos x)^2 = 1 and friends
Compound angle formulas (sin (A+B) = something)
Double angle formulas eg cos(2x) = three different things

[/0]

I think this one's quite cool, probably not useful though:



If you can be bothered memorising there's a lot on wikipedia

[cara.mel]

If you can be bothered memorising there's a lot on wikipedia

where.

[/0]

If you can be bothered memorising there's a lot on wikipedia

where.

http://en.wikipedia.org/wiki/List_of_trigonometric_identities

Also useful http://en.wikipedia.org/wiki/Factorisation

[fredrick]

The 3 types on the formula sheet is enough i dont think you need to know all those fancy ones

[shinny]

You can't use them anyway...examiners would be like wtf? How'd he get there.

[Matt The Rat]

Yeah, I was told to stick to the main Spec way of doing things so that examiners don't flip out.