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The video is structured in two parts: 1. In the first part, the expression equivalent to the sine of the sum of two angles is constructed using a geometric analysis in GeoGebra. Based on it, two Trigonometric Identities (Lemmas) are demonstrated that will be used to carry out the demonstration. 2. In the second part, the proposition is demonstrated using the Principle of Mathematical Induction and the Lemmas previously presented. #maths #mathematics #demonstration #demonstration