Write sin(3x) in terms of sinx

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Rewrite sin(3x) in terms of sinx using double argument and composite argument formulas
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Dude you have figuratively saved my life. THANK YOU

rosalatton
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Not only posted on my birthday, but the only thing I've been able to find so far that /actually/ explains what happens. 

lovefrombooks
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Thanks very Awesome video. Really helpful!

benst
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can you explain the distributive property of (2sinxcosx)cosx??

brianm.
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This was incredibly helpful! thank you :)

mariyasheikh
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woooowwww!! thanks a lot!! it helped me.

רותיכהן-מר
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:D this is great thanks for the help man

przcouldyou
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Why didn't you distribute the cos x to the sin x and 2?

GloverBonez