Mathematics
Junior High
Resolved
（3）の解き方を詳しく教えて下さい。
お願いします՞･ｰ･̥՞
※（1）は解答不要です.ᐟ
sin² 40°+sin²50°*(2)
* (sin 70°+sin 20°)²-2 tan 70° cos² 70°
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