Okay, I managed to read through the 定義 section as well. And I was glad to see some of the terms from the triangle section and circle section in the Math 2.1 video popping up. As well as the basic terms for 1D and 2D spaces as discussed in Math 2.2. Interestingly, 辺 is used for “edge” in a mathematical / geometrical context. So, I really hope you could reinforce at least some of last weeks vocab marathon 
Week 5 ~ Are you reading with us?
- I’m reading along
- I’ll catch up later
- I’ll skip this one
- I’ve dropped it completely
- Nope, only here for polling
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Q17: 三角関数を選んでください。
- 正弦関数
- 余弦関数
- 指数関数
- 対数関数
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Q18: 実数の範囲の定義を選んでください。
- 直角三角形による定義
- 単位円による定義
- 級数による定義
- 微分方程式による定義
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