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Magick 6 - 6 Fundamental Trigonometric Identities & Their Proofs [By Tiago Hands, http://www.mathsvideos.net]
Learn how to derive the 6 most fundamental trigonometric identities sin(A±B), cos(A±B) and tan(A±B) from absolute scratch.
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http://mathsvideos.net/magick-6-6-fundamental-trigonometric-identities-their-proofs/
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