Mathematics
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数字Ⅰの図形と計量の問題です。
cos²44°+cos²45°+cos²46°の式の値を教えてください🙇‍♀️
答えは3/2なのですが、どうしても1/2になってしまいます。

三角比

Answers

✨ Best Answer ✨

cos45°=1/√2
cos²45°=1/2

cos44°=cos(90°-46°)=sin46°
sin²46°+cos²46°=1

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