Mathematics
Senior High
この問題の解き方を教えて欲しいです
200
0203+0200
293. 次の式の値を求めよ。
□ (1) sin 10°sin 170°-cos 10°cos 170°
□ (2) (sin 25°+cos 155°)+2sin 155°cos
25°+0nia)
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