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Jul
20
comment Deriving the sum-to-product identities
Thank you for your answer!
Jul
20
accepted Deriving the sum-to-product identities
Jul
20
comment Deriving the sum-to-product identities
Thank you, that was a very concise and clear explanation
Jul
20
comment Deriving the sum-to-product identities
@heropup, thanks, i see what you mean now..
Jul
20
comment Deriving the sum-to-product identities
@AndréNicolas, Why is it that I need to use different letters?
Jul
20
asked Deriving the sum-to-product identities
Jul
20
comment Soviet Russian Mathematical Books
Just to add to this, a publisher going by the name of MIR seems to have been a big player in publishing texts by prominent Soviet mathematicians, however it is very difficult to get hold of those books today, some of them can be found on the site mirtitles.org
Jul
14
revised A few questions regarding the cosine difference identity
added 65 characters in body
Jul
14
accepted Applying the cosine even identity to the cosine difference identity
Jul
14
comment Applying the cosine even identity to the cosine difference identity
Just what I was looking for!
Jul
14
comment Applying the cosine even identity to the cosine difference identity
Yes you're right! Thanks!
Jul
14
asked Applying the cosine even identity to the cosine difference identity
Jul
14
revised A few questions regarding the cosine difference identity
added 141 characters in body
Jul
14
revised A few questions regarding the cosine difference identity
added 141 characters in body
Jul
14
comment A few questions regarding the cosine difference identity
I manipulated the equation I get that, however what I square rooted the R.H.S of the equality: $$2 - 2\cos (\alpha - \beta )$$; there hasnt been much manipulation done to this (apart from using the pythagorean identity to simplify some trig expressions), would that give me the length of the two chords?
Jul
14
awarded  Popular Question
Jul
13
comment A few questions regarding the cosine difference identity
I dont understand how it's possible to have a negative cosine value in the first quadrant? Could you explain a little more on this please.
Jul
13
asked A few questions regarding the cosine difference identity
Jul
13
comment How can I understand and prove the “sum and difference formulas” in trigonometry? (cos(a ± b) = …, etc.)?
Thank you, this looks like a neat application
Jul
13
comment How can I understand and prove the “sum and difference formulas” in trigonometry? (cos(a ± b) = …, etc.)?
with program did you draw this diagram?