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alekseicat
@alekseicat
November 2021
1
17
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Номер 5!!! Срочно пожалуйста!!
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Вендеттаза
Tg3a=tg(2a+a)=(tg2a+tga)/(1-tg2a*tga)=(2*tga/(1-(tga)^2)+tga)(1-2*(tga)^2/(1-(tga)^2))=
=(2*tga+tga-(tga)^3)/(1-(tga)^2-2*(tga)^2)=(3*tga-(tga)^3))(1-3*(tga)^2)
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=(2*tga+tga-(tga)^3)/(1-(tga)^2-2*(tga)^2)=(3*tga-(tga)^3))(1-3*(tga)^2)