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Hi my friends,

 

just a quick one please...smiley

 

How do we get Cos2x from \(2Cos^2x-1\)?

 

Thank you al;l so much!!

 Sep 16, 2020
 #1
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See a very clear solution here: https://socratic.org/questions/582476bab72cff56d798b941#:~:text=1%20Answer&text=By%20the%20sum%20and%20difference,B%E2%88%92sinAsinB%20.&text=Use%20the%20identity%20sin2,%3D1%E2%88%92cos2%CE%B8%20.&text=This%20identity%20has%20been%20proved!

 Sep 16, 2020
 #2
avatar+634 
+1

Thanx a million!

juriemagic  Sep 17, 2020

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