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all topics on trigonometry - https://vuroki.ru/algebra_10_klass more lessons on TRIGONOMETRY - • SINE COSINE TANGENT OF HALF ANGLE... SOLUTION OF PROBLEMS AND EXAMPLES - https://vk.com/club49102005 In this video lesson on trigonometry for 10th grade students, the formulas for the double angle for sine, cosine, tangent and cotangent are explained, examples from textbooks by Mordkovich Nikolsky Kolyagin Makarychev Alimov are solved. #sine #cosine #ANGLE #trigonometry