「いちちの数学」_三角比（余弦定理）
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From: ichichi2010
Added: 16 years ago · 3:48 · 480p
It is a basic, official explanation of a triangular ratio.
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Views: 1,214
From: ichichi2010
Added: 16 years ago · 3:48 · 480p
It is a basic, official explanation of a triangular ratio.
No comments yet.