Answer: Um...is there supposed to be a link? I'll edit my answer if there is.
 
        
             
        
        
        
Answer:
Not sure sorry, Have a great day!
Step-by-step explanation:
 
        
             
        
        
        
Answer:
irrational 
are the numbers like 7.55782902..where the numbers aren't repeated
 
        
             
        
        
        
Answer:
If you need anything just let me know.
Step-by-step explanation:
Hope you have a good day.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
2 cos x + √ 2 = 0
2 cos x = -√ 2 
cos x = -√ 2  / 2
x = arcCos(  -√ 2  / 2 )
so to solve we have to use  "co-terminal " angles .. do you know what I'm saying?  do you understand the words coming out of my mouth :DDDDD OKay back to math and not movie lines .. :P
x = arcCos(  √ 2  / 2 )
x = 45 °
now find the "co terminal" angle that is on 45 ° but in the correct quadrant... since the  -√ 2   is negative.. we now that we go down the y axis.. but also positive on the x axis.. soooo.. that put the angle in the 4th quadrant... so this is an angle of 315° if we go in the CCW  ( counter clock wise )  direction but it's also -45°  in the CW  (clock wise )  direction 
below is the table to remember the trig special angles
notice how it's  1,2,3,4    .. so it's super easy to remember.. the trig books don't show you this "trick"   :P 
copy and paste this to your computer some where handy
Sin(0) = 0/2      =0  
Sin(30)=  /2   = 1/2
/2   = 1/2  
Sing(45) = /2 =
/2 = /2
/2  
Sin(60)= /2   =
/2   =  /2
/2  
Sin(90)= /2   = 1
/2   = 1  
Cos is exactly the same but counts backwards from 90°
Cos(90) = 0/2       = 0
Cos(60) =  /2   = 1/2
 /2   = 1/2
Cos(45) =  /2    =
/2    = /2
/2
Cos(30) =  /2   =
/2   = /2
/2
Cos(0) =  /2    = 1
/2    = 1