Answer:
steps below
Step-by-step explanation:
Are you going to solve the value of A or just a proof the equation
cos 2A = cos² A - sin² A
2cos²A-cos2A-1 = 2cos²A - (cos² A - sin² A) - 1 = cos² A + sin² A - 1
2cos²A-cos2A-1 = 1 - 1 = 0
A: 90° or 270° or 450° .....
Using the variable x for the unknown number,
20 - (x + 4) = 6
is your answer!
Hope I helped :)
C^2+7 would equal 88. the first equation states that C=9, so you can just plug in 9 for C
Answer:
if it is an a or b B is the best answer but if it a true of false. the answer is true
Step-by-step explanation:
The answer would be 112.5 plz give me thanks and full rating PLZZZZZZ
