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nikitwwe
@nikitwwe
July 2022
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геометрия реще. Умоляюююююю
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igir12370
1) Sina=5/13;(Sina)^2+(Cosa)^2=1;(5/13)^2+(Cosa)^2=1;(Cosa)^2=1 - 25/169;(Cosa)^2=144/169;Cosa=-12/13 (взят минус, так как угол лежит во второй четверти);tga=Sina/Cosa=5/13 : (-12/13)=5/13 * (-13/12)=-5/12;ctga=1/tga=-12/5=-2,4;
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