+0  
 
+1
246
1
avatar+935 

I'm a bit confused on how to do this... Show Work!

 May 21, 2019
 #1
avatar+111328 
+4

sin (30°)  =  1/2

But....the cosine (120°)  =   -cos(60°)  =  -1/2

 

The cosines of (1), (2) and (3)    = 1/2

 

So......(4)  is correct

 

cool cool cool

 May 21, 2019

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