Mathematics
Senior High
なぜ、sinからcosになるんですか、？？
23 三角比の相互関係の
4
基本 177 次の三角比を, 45°以下の角の三角比で表せ。
(1) sin 54°
(2) cos 61°
Sin 54°=sin(000-360)
= Cos36°
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