Преобразуй в произведение. $\sin\dfrac{\pi}{3}-\sin\dfrac{\pi}{7}$ $2\sin\dfrac{2\pi}{21}\cos\dfrac{5\pi}{21}$ $2\sin\dfrac{4\pi}{21}\cos\dfrac{10\pi}{21}$ $2\cos\dfrac{2\pi}{21}\cos\dfrac{5\pi}{21}$ $2\sin\dfrac{5\pi}{21}\cos\dfrac{2\pi}{21}$

Задание

Преобразуй в произведение.

\(\sin\dfrac{\pi}{3}-\sin\dfrac{\pi}{7}\)

Выбери верный вариант.

\(2\sin\dfrac{2\pi}{21}\cos\dfrac{5\pi}{21}\)
\(2\sin\dfrac{4\pi}{21}\cos\dfrac{10\pi}{21}\)
\(2\cos\dfrac{2\pi}{21}\cos\dfrac{5\pi}{21}\)
\(2\sin\dfrac{5\pi}{21}\cos\dfrac{2\pi}{21}\)