Mathematics
Senior High
解き方を教えて欲しいです🙇♀️
257 次の式の値を求めよ。
+20
(1) sin10°sin 170°-cos10°cos170°
(2) (sin25°+cos155°)² +2sin155°cos25°
(3)
sin40°+cos140°+sin50°+cos130°
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