+0  
 
+2
81
1
avatar+293 

help please

 Nov 24, 2020
 #1
avatar+116126 
+2

Second blank

 

sin^2 x  - 1 

___________

(sin (x) + 1)^2

 

Note  that   sin^x  + cos^2x  = 1  →     sin^x - 1  =   -cos^2x

 

Third blank

 

-(cos^2 x)

__________

(sin (x) + 1)^2

 

 

 

cool cool cool

 Nov 24, 2020

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