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avatar+559 

cos(−θ)=3√4 ,  sinθ<0

 Feb 21, 2018
 #1
avatar+99580 
+2

Note....cos (-theta)  = cos (theta)

 

sin (theta)  =  - sqrt ( 1^2  - (sqrt (3)/4)^2 )   =  -sqrt ( 1 - 3/16)  = -sqrt (13) /4  

 

 

 

cool cool cool

 Feb 22, 2018

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