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1
Proof of the sine angle addition identity (video) - Khan Academy
https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:angle-addition/v/proof-angle-addition-sine
2
Proof of the sum and difference formulas. - The Math Page
https://www.themathpage.com/aTrig/sum-proof.htm
3
[PDF] The addition formulae | Mathcentre
https://www.mathcentre.ac.uk/resources/uploaded/mc-ty-addnformulae-2009-1.pdf
4
Sine and Cosine Addition Formula Proof - YouTube
https://m.youtube.com/watch?v=XdYTTBFm5Hw&pp=ygUJI3NpbmFjb3Ni
5
Trigonometric Addition Formulas -- from Wolfram MathWorld
https://mathworld.wolfram.com/TrigonometricAdditionFormulas.html
6
[PDF] Proof of Sum and Difference Identities
https://mymission.lamission.edu/userdata/sargsye2/docs/Math%20240/Proof%20of%20the%20difference%20formula%20for%20cosine.pdf
7
How can I understand and prove the "sum and difference ...
https://math.stackexchange.com/questions/1292/how-can-i-understand-and-prove-the-sum-and-difference-formulas-in-trigonometry
8
Proofs of trigonometric identities - Wikipedia
https://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities
9
Proof of angle addition formula for sine | Trigonometry - YouTube
https://www.youtube.com/watch?v=R0EQg9vgbQw
10
Sin (a + b) - Formula, Proof | What is Sin a Plus b? - Cuemath
https://www.cuemath.com/trigonometry/sin-a-plus-b/