
Step-by-step explanation:
We know that
cos 2x = 2cos²x - 1
So we have

Substituting 

Answer:
(-b) is the answer.
Step-by-step explanation:
2(a-b)-(2a-b)
=2a-2b-2a+b (opening the brackets)
= -b
Hope this helps you buddy. Have a nice day^_^.
If you have doubt then you can ask in comments. I will surely answer.
Answer:
(f(x) g(x)) =
all real numbers
Step-by-step explanation:
(f(x) g(x)) = 
=
via FOIL
Answer:
NO IT IS 4
Step-by-step explanation: