29 degrees. You can just add 12 and 17 to find this, since the 12 is negative
        
             
        
        
        
Answer: I think the last option is the correct answer.
Step-by-step explanation:
 
        
                    
             
        
        
        
-2 - 3 -(-4)= -2 - 3 + 4
-2 - 3 + 4
-5 + 4
= -1
        
                    
             
        
        
        
Answer:
B
Step-by-step explanation:
Using the exact values
cos150° = - cos30° = - 
sin150° = sin30° = 
Given
z = 4(cos150° + isin150° ) , substitute values
   = 4(-  +
 +   i )
i ) 
   = - 2 + 2i , that is
 + 2i , that is
(- 2 , 2 ) → B
, 2 ) → B
 
        
             
        
        
        
Answer:
Step-by-step explanation:
I assume that you mean
sec(x)-tan(x) = 1 / ( sec(x) + tan(x) ) , right ?
then this is equivalent to
[ sec(x) - tan(x) ] x [ sec(x) + tan(x) ] = 1
let s evaluate it, we got
sec2(x) - sec(x)tan(x) + - sec(x)tan(x) - tan2(x) = sec2(x) - tan2(x) 
= (1 - sin2(x) ) / cos2(x) = cos2(x) / cos2(x) = 1
as cos2(x) + sin2(x) = 1