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what is the exact value for Quadrant II, sin=4/5

 Sep 23, 2016
 #1
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Beats me

 Sep 24, 2016
 #2
avatar+37203 
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The exact value of WHAT?   The angle? (don't know)      The cosine? (-3/5) 

 Sep 24, 2016
edited by ElectricPavlov  Sep 24, 2016

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