Question

5sin13пи /12cos 13пи/12, помогите

Answer 1

Ответ:

$1,25$

Пошаговое объяснение:

$5sin\frac{13\pi}{12}cos\frac{13\pi}{12}=2,5*(2sin\frac{13\pi}{12}cos\frac{13\pi}{12})=2,5sin(\frac{2*13\pi}{12})=\\\\=2,5sin\frac{13\pi}{6}=2,5sin(\frac{12\pi}{6}+\frac{\pi}{6})=2,5sin(2\pi+\frac{\pi}{6})=\\\\=2,5sin\frac{\pi}{6}=2,5*0,5=1,25$