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Verifying trig identity

  • Thread starter phys1618
  • Start date
  • #1
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Homework Statement



(sin 3α/sin α) - (cos 3α/cosα) =2

Homework Equations





The Attempt at a Solution



I know for sin 2 α I would put 2 sinαcosα, so for 3α, do I just put 3sinαcosα?
for cos 3α, I'm sorta clueless because there's 3 we can use for cosine,
Then after that step, I know to get both of them on the LHS to have a common denominator, which sinα cosα, please help. Thank yyou in advance!
 

Answers and Replies

  • #2
symbolipoint
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Start with the angle-sum formulas.
 

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