問題文全文(内容文)：
◎次の式を簡単にしよう。
①$\sin (\displaystyle \frac{π}{2}+\theta)+\sin (\displaystyle \frac{π}{2}-\theta)+\cos (-\theta)$
②$\cos (\displaystyle \frac{π}{2}+\theta)+\cos (\displaystyle \frac{π}{2}-\theta)+cos (-\theta)+\cos (π-\theta)$
③$\sin (\displaystyle \frac{π}{2}+\theta)\sin (\displaystyle \frac{π}{2}-\theta)-\sin (π+\theta)\sin (π-\theta)$
◎次の式を簡単にしよう。
①$\sin (\displaystyle \frac{π}{2}+\theta)+\sin (\displaystyle \frac{π}{2}-\theta)+\cos (-\theta)$
②$\cos (\displaystyle \frac{π}{2}+\theta)+\cos (\displaystyle \frac{π}{2}-\theta)+cos (-\theta)+\cos (π-\theta)$
③$\sin (\displaystyle \frac{π}{2}+\theta)\sin (\displaystyle \frac{π}{2}-\theta)-\sin (π+\theta)\sin (π-\theta)$
単元：
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指導講師：
とある男が授業をしてみた
問題文全文(内容文)：
◎次の式を簡単にしよう。
①$\sin (\displaystyle \frac{π}{2}+\theta)+\sin (\displaystyle \frac{π}{2}-\theta)+\cos (-\theta)$
②$\cos (\displaystyle \frac{π}{2}+\theta)+\cos (\displaystyle \frac{π}{2}-\theta)+cos (-\theta)+\cos (π-\theta)$
③$\sin (\displaystyle \frac{π}{2}+\theta)\sin (\displaystyle \frac{π}{2}-\theta)-\sin (π+\theta)\sin (π-\theta)$
◎次の式を簡単にしよう。
①$\sin (\displaystyle \frac{π}{2}+\theta)+\sin (\displaystyle \frac{π}{2}-\theta)+\cos (-\theta)$
②$\cos (\displaystyle \frac{π}{2}+\theta)+\cos (\displaystyle \frac{π}{2}-\theta)+cos (-\theta)+\cos (π-\theta)$
③$\sin (\displaystyle \frac{π}{2}+\theta)\sin (\displaystyle \frac{π}{2}-\theta)-\sin (π+\theta)\sin (π-\theta)$
投稿日：2015.08.03