sin50°=cos40°になるのでsin²+cos²で1になります。
どうして上のようになるのかは、直角三角形を書いて、見方を変えてみると分かるので試してみてください
Mathematics
Senior High
これを詳しく解説して下さい。
理解不能なので。
ちなみに、答えは(1)が1、(2)が0、(3)が1です
問題2
次の式の値を求めよ。
(1) sin?40° + sin'50°
(2) tan35° tan55° - tan15° tan75°
(3)(sin 70° + sin 20°)?- 2tan70°cos?70°
Answers
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