4 (e)  
sin^8 x - cos^8 x
= (sin^4 x + cos^4 x)(sin^4 x - cos^4 x)
= (sin^4 x + cos^4 x)(sin^2 x - cos^2x)(sin^2 x +cos^2 x)
=  (sin^4x + cos^4 x)( sin^2 x- cos^2 x)
Sorry I cant do 4 (d).
        
             
        
        
        
E+r=
(e=9) 
r=1.50) 
or 9+1.50= 
I think
        
             
        
        
        
Answer:
stuff 
Step-by-step explanation:
i do not know
 
        
             
        
        
        
The small and large triangles are similar 
so  3 / (3+3) = 9 / AC
9 / AC = 1/2
#AC = 18 ft Answer