Mathematics
Senior High
なんでcos10°になるんですか？教えて欲しいです。
Training
教p.142問 12
239 次の三角比を45°以下の角の三角比で表せ。
1) sin 80°
トレーニング
VOISIK
237
(1) sin80°= sin (90°-10°)=cos10°
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