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Ister Exercise 2.12 Geometry 9 (Mathematics9 No. 2.12 )NUSH-2026 § 2. Sine, cosine, tangent of angles from 0 to 180. Trigonometric identities. • Істер Вправа 2.12 Геометрія 9 (Математика9... №2.12. Find the acute angle β using a calculator or tables if: 1) cos β = 0.6691; 2) tg β = 2.0965.The material corresponds to the current program "Geometry 9th grade NUSH" according to the textbook Algebra: textbook for 9th grade of general secondary education / Oleksandr Ister, Dmytro Ister – Kyiv: Geneza-2026 Author of the video Kovalenko Tetyana Vasylivna
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