Cos(x+pi/3)+cos(x-pi/3)=cosx Have the show the statement and the rules? Thanks again
4 Answers
Recall that
As required.
Hopefully this helps!
Please see below.
Explanation:
.
We have a Sum to Product formula that gives us:
Using this formula, we get:
See below.
Explanation:
Identities:
I'll do these in two parts, because of space:
As required:
Well, I don't know the rules on your Rule Menu, so I'm using mine.
LHS
Applying,