Japanese Junior High over 7 yearsago

分からないので教えてください！

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English Junior High over 7 yearsago

(20)(21)(29)が分かりません。 答えはそれぞれ、in(within),with,anything elseです。

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Mathematics Junior High over 7 yearsago

接弦定理ってなんですか？

Mathematics Junior High over 8 yearsago

この問題の解き方の式がなぜこうなるのか分かりません。教えてください。