Hi i'm new,

I have been trying to solve this for a couple of days and had to just give up. Hopefully it is in the right topic.

I have a system which gives me the answer to COS(A+B) and I can work out what B is.

Therefore:-

COS(A+B) = (Known Varible Output)

B = (Known Constant)

What is COS A ?

(I don't need to know what A is - just COS A)

The solution needs to work for a full COS cycle (i.e. 0 to 2PI) therefore the answer is not COS((COS-1(A+B))-B) !

I have been trying to use COS(A+B)=COSACOSB-SINASINB

and COS^2(A)+SIN^2(A)=1

with no luck just can't seem to be able to rearange the formula.

If anyone can solve this I would be very thankful/amazed.

Dave