Answer
The expression is equivalent to sin^{2}x
The first step is to multiply the two expressions between parentheses :
(II)
There is a trigonometric identity that states :
Working with this expression :
 ⇒
 (I)
Using the equation (I) in (II) :
 ⇒
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Answer:
the shape is semetrical
Step-by-step explanation:
 
        
                    
             
        
        
        
The three integers are: 12, 13, and 14
12+13=25
25+14=39
 
        
             
        
        
        
Answer:
-18x+73
Step-by-step explanation:
-9 times 2x is -18x
-9 times -7 is 63
63+10=73 
so, -18x+73 is your answer