Одарённые дети в школе интеллектуального развития
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![[MEKTEП OnLine MATEMATИKA] Тригонометрические функции, y=tgx и y=ctgx, их свойства и графики. 10 класс.](https://sun9-52.userapi.com/impg/XZ98M5Ki7tv3z5r7fjHSif-ZfnQKq5PEtMpbPQ/Ps8wq7n8J50.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=3b3f7aa3d2170e2668d42af311cd0b39&c_uniq_tag=XZlpojHHCxq7D3cxbQ2vYpeK_I5Nhnngb7H9jG01oxU&type=video_thumb)
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