Answer:

Step-by-step explanation:
Let  , we proceed to transform the expression into an equivalent form of sines and cosines by means of the following trigonometrical identity:
, we proceed to transform the expression into an equivalent form of sines and cosines by means of the following trigonometrical identity:
 (1)
 (1)
 (2)
 (2)
Now we perform the operations: 



 (3)
 (3)
By the quadratic formula, we find the following solutions:
 and
 and 
Since sine is a bounded function between -1 and 1, the only solution that is mathematically reasonable is: 

By means of inverse trigonometrical function, we get the value associate of the function in sexagesimal degrees:

Then, the values of the cosine associated with that angle is:

Now, we have that  , we proceed to transform the expression into an equivalent form with sines and cosines. The following trignometrical identities are used:
, we proceed to transform the expression into an equivalent form with sines and cosines. The following trignometrical identities are used:
 (4)
 (4)
 (5)
 (5) 




If we know that  and
 and  , then the value of the function is:
, then the value of the function is:


 
        
             
        
        
        
Answer:
$4.99
Step-by-step explanation:

 
        
                    
             
        
        
        
English please no habla espanol
        
             
        
        
        
Answer:
.62 cents per box
Step-by-step explanation:
Take the total cost and divide by the number of boxes to get the unit cost
4.98 / 8
.6225 per box
It states to round to the nearest cent
.62 cents per box