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avatar+2448 

Part of a two-­column proof is shown with just the statements described.

 Feb 22, 2018
 #1
avatar+99586 
+3

Statements  1  and 2 only

These statements are the definitions of  sin (x) and cos(y), respectively

 

Statement 4  is a consequence of substitution

 

So  "C"  is correct

 

 

cool cool cool

 Feb 22, 2018

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