問題文全文(内容文)：
これを解け.
$\displaystyle \prod_{k=1}^7 \cos\dfrac{\pi}{15}\pi=\cos\dfrac{\pi}{15}\cos\dfrac{2\pi}{15}\cos\dfrac{3\pi}{15}\cos\dfrac{4\pi}{15}\cos\dfrac{5\pi}{15}\cos\dfrac{6\pi}{15}\cos\dfrac{7\pi}{15}$
これを解け.
$\displaystyle \prod_{k=1}^7 \cos\dfrac{\pi}{15}\pi=\cos\dfrac{\pi}{15}\cos\dfrac{2\pi}{15}\cos\dfrac{3\pi}{15}\cos\dfrac{4\pi}{15}\cos\dfrac{5\pi}{15}\cos\dfrac{6\pi}{15}\cos\dfrac{7\pi}{15}$
単元：
#数Ⅱ#三角関数#数学(高校生)
指導講師：
鈴木貫太郎
問題文全文(内容文)：
これを解け.
$\displaystyle \prod_{k=1}^7 \cos\dfrac{\pi}{15}\pi=\cos\dfrac{\pi}{15}\cos\dfrac{2\pi}{15}\cos\dfrac{3\pi}{15}\cos\dfrac{4\pi}{15}\cos\dfrac{5\pi}{15}\cos\dfrac{6\pi}{15}\cos\dfrac{7\pi}{15}$
これを解け.
$\displaystyle \prod_{k=1}^7 \cos\dfrac{\pi}{15}\pi=\cos\dfrac{\pi}{15}\cos\dfrac{2\pi}{15}\cos\dfrac{3\pi}{15}\cos\dfrac{4\pi}{15}\cos\dfrac{5\pi}{15}\cos\dfrac{6\pi}{15}\cos\dfrac{7\pi}{15}$
投稿日：2021.03.08
