Hello
the answer is d
have a nice day
Answer:
and 
Step-by-step explanation:
We are given that sin x+cos x=cos 2x
We have to solve the given equation for 

Because 








Tan x is positive in I and III quadrant
In III quadrant angle
replace by 
Therefore, 

Answer:
y=1/4x+7/4
Step-by-step explanation:
i think its right
The answer is B. because it is 6:9 which simplifies down to 1:3