Last edited by wiseguy; August 6th 2010 at 10:29 AM.
Follow Math Help Forum on Facebook and Google+
In the "little prince" there is a line: "Draw me a sheep!"
Now, instead of using composite argument property for cosine and instead drawing me something.... draw to yourself a unit circle.
I understand that cos(90-x)=sin, I just have no idea how to interwind it with the composite argument property
Well, let's try it.
But cos(90) = 0 and sin(90) = 1.
Last edited by Unknown008; July 26th 2010 at 09:50 AM.
Reason: dup =(
Originally Posted by wiseguy "Use the composite argument property for cosine to prove that "
I'm aware the composite argument property of cosine is - how would you use that to show ? You do realise that your formatting is messed up, right?
From context, you mean
prove that .
So let and and write it out..