Mathematics
Senior High
なぜsin²40°(90°-40°)がcos²40°になるのか教えてください！
3 次の式の値を求めよ。
sin 240° + sin 250°
5 t = sin³² 40° + sin² (90°-40°)
= sin²40° + cos² 40²
= 1
35°tan 55°-tan 15°tan 75°
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