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all topics on trigonometry - https://vuroki.ru/algebra_10_klass more lessons on TRIGONOMETRY - • REDUCTION FORMULAS Grade 10 trigonometry... SOLUTION of problems and EXAMPLES - https://vk.com/club49102005 In this video lesson on trigonometry for 10th grade students, the formulas of half angles for sine, cosine, tangent and cotangent are explained, examples from textbooks Mordkovich Nikolsky Kolyagin Makarychev Alimov are solved. #ANGLE #trigonometry #sine #cosine