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Trig Addition Identities Explained by mousypusa is a document available to read on EtoBox.

The cosine law relates the sides and angles of a triangle: C^2 = A^2 + B^2 - 2ABcosθ, where θ is the angle opposite side C. Trigonometric addition formulae relate trigonometric functions of sums and differences of angles. For example: sin(x+y) = sinx cosy + cosx siny. Proofs of the addition formulae are given using trigonometric identities, Pythagoras

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mousypusa

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EN