Hoda Kotb’s SECRET LOVE FINALLY UNMASKED—You Won’t BELIEVE Who It Is

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在数学中sin，cos，tg，ctg分别表示； sina= (∠a的对边)/ (∠a的斜边)，cosa= (∠a的邻边)/ (∠a的斜边)。一种是tan,一种就是tg了,我们现在常用tan,多用tg表示正切函数，ctg表示余切函数现在. Почему много людей зачастую ставят в свое описание tg://settings да и вообще просто отправляют в чат, что это такое и зачем.

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