Images 2 TG A SIN 2A

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2 tg a sin 2a. 2tg^2a+TGA-2=0. (TGA+ctga)2-(TGA-ctga)2. Sin2a ctga-1. Sin^2a = 1/TGA.
2tg^2a+TGA-2=0. (TGA+ctga)2-(TGA-ctga)2. Sin2a ctga-1. Sin^2a = 1/TGA.

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