+0  
 
0
52
2
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Choose the following

Guest Nov 12, 2018
edited by Guest  Nov 12, 2018
edited by Guest  Nov 12, 2018
 #1
avatar+316 
+1
Dimitristhym  Nov 12, 2018
 #2
avatar+92608 
+2

We have the following identity :

 

sin ( - θ)  =  -sin ( θ)

 

So

 

-sin ( θ)  =   1/5

 

So

 

sin ( θ)  = - 1/5

 

So

 

tan  θ  =   sin  θ  / cos  θ

 

cos  θ  =   sin  θ  / tan  θ

 

cos  θ    =  (-1/5)  /  [ √6 / 12 ]   =  -12 / [ 5 √6]  =  -12√6 / 30  =  -2√6/ 5  

 

 

cool cool cool

CPhill  Nov 12, 2018

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