Answer:

Step-by-step explanation:
Given that,

We need to find the value of cos x.
We know that,

Using the above relation,

So, the value of cos x is equal to  .
.
 
        
             
        
        
        
Answer:
x < .6
Step-by-step explanation:
 1+5x<4
Subtract 1 from each side
 1-1+5x<4-1
5x<3
Divide each side by 5
5x/5 <3/5
x < .6
 
        
             
        
        
        
Answer:
7
Step-by-step explanation:
(x-2)^2
x^2-4x+4
-3^2-4(-3)+4=7