Mathematics
Senior High
Resolved

赤ペンのところがわかりません。
なんで、マイナスがなくなるのですか?

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✨ Best Answer ✨

sin(-θ)=-sinθ
cos(-θ)=cosθ
tan(-θ)=-tanθ

これ基本です!単位円を想像すれば、覚えなくても理解できると思います。

RinaRina

ありがとうございます!

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