Mathematics
Senior High
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どうしてこうなるのか教えてほしいです

95AC22 2 。 んwe > (ooの6だ
数ⅲ 三角関数 微分

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✨ Best Answer ✨

加法定理の逆です!
cos(x+5x)=cosxcos5x-sinxsin5x

けも

なるほど、助かりました!
ありがとうございます!

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