Setting functions equal to each other to cancel

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getty102
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Homework Statement



sin(3x)=3sin(x)

Homework Equations





The Attempt at a Solution



How do you solve this for x?
 

Discussion

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What identity can you replace sin(3x) with? (Hint: you want to write everything in terms of sinx)
 
Well I came up with;
(1+2cos(2x))sinx=3sinx

but that didn't work either
 
getty102 said:
Well I came up with;
(1+2cos(2x))sinx=3sinx

but that didn't work either


and you can replace cos(2x) by?
 

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