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How to solve this?

Thread in Studies created by XXXXXXXXXX Jun 16, 2021. 100 views

  1. XXXXXXXXXX
    XXXXXXXXXX Topic starter Jun 16, 2021 93 Dec 6, 2018
  2. Skynet_0
    Skynet_0 Jun 16, 2021 16 Apr 11, 2020
     
    1. Skynet_0
      Skynet_0, ctgx =1/tgx - упрощение
  3. Eternusta
    XXXXXXXXXX, 4. -7
    tg и ctg сокращаются
    -3-4=-7
     
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