Option C:
x = 90°
Solution:
Given equation:

<u>To find the degree:</u>

Subtract 1 + cos²x from both sides.

Using the trigonometric identity:




Let sin x = u

Factor the quadratic equation.

u + 2 = 0,  u – 1 = 0
u = –2, u = 1
That is sin x = –2, sin x = 1
sin x can't be smaller than –1 for real solutions. So ignore sin x = –2.
sin x = 1
The value of sin is 1 for 90°.
x = 90°.
Option C is the correct answer.
 
        
                    
             
        
        
        
Answer:
-1
Step-by-step explanation:
1+13=14
(14)2=28
28-29=-1
 
        
                    
             
        
        
        
So you would do,
18 gallons of water divided by 0.5 gallons of water 
if you did that correctly you should have gotten... 36 jugs
        
             
        
        
        
Answer:
5 hours
Step-by-step explanation:
75 + 55x = 350
75 - 75 + 55x = 350 - 75
55x = 275

x = 5
 
        
             
        
        
        
Answer:
B. 66-18=28+20
Step-by-step explanation: