Lily - Vol. 1 Ch. 2

Joined
Feb 3, 2018
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I just wanted to point out that the correct double angle formula for cosine would be
Code:
cos(2a)=cos[sup]2[/sup](a)-sin[sup]2[/sup](a)=2cos[sup]2[/sup](a)-1=1-2sin[sup]2[/sup](a)
 

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