In the whole wide world of math, there is only one number that equals 19.  
That number is . . . . . . . . . . wait for it . . . . . . . . . . 19 .
        
                    
             
        
        
        
Answer:
0.75
Step-by-step explanation:
3/4=0.75
Hope this helps! :)
 
        
             
        
        
        
-13/24 because u have to multiply to get the same denominator which would end up being -15/24 and 2/24 add that to get -13/24
        
             
        
        
        
I hope this helps you
(1-cosx)(1+cosx)=1+cosx-cosx-cos²x=1-cos²x=sin²x
sin²x
____
cos²x
tg²x