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What is cos(-150)? 

 

 

Thx

 Feb 17, 2021

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 #1
avatar+130477 
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-150   =   360   -150   =  210°

 

cos (210°)  =  -cos (30°)   =  -sqrt ( 3)   / 2

 

 

 

cool cool cool

 Feb 17, 2021

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