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:
We cant see none bro or sis we dont judge here
Answer:
2x - 1
Step-by-step explanation:
Since logarithm has the following property:
If
and
,
Then
and 
Therefore,

You just subtract the number
Range is ] -20 , -10 [
both points are disclude according to the empty circle