Преобразуй в произведение. $\cos\dfrac{\pi}{3}+\cos\dfrac{\pi}{5}$ $2\cos\dfrac{8\pi}{15}\cos\dfrac{8\pi}{15}$ $2\cos\dfrac{4\pi}{15}\cos\dfrac{\pi}{15}$ $2\sin\dfrac{4\pi}{15}\cos\dfrac{\pi}{15}$ $2\sin\dfrac{\pi}{15}\sin\dfrac{4\pi}{15}$

Задание

Преобразуй в произведение.

\(\cos\dfrac{\pi}{3}+\cos\dfrac{\pi}{5}\)

Выбери верный вариант.

\(2\cos\dfrac{8\pi}{15}\cos\dfrac{8\pi}{15}\)
\(2\cos\dfrac{4\pi}{15}\cos\dfrac{\pi}{15}\)
\(2\sin\dfrac{4\pi}{15}\cos\dfrac{\pi}{15}\)
\(2\sin\dfrac{\pi}{15}\sin\dfrac{4\pi}{15}\)