Prove that: \[ \sin \frac{13 \pi}{3} \sin \frac{8 \pi}{3}+\cos \frac{2 \pi}{3} \sin \frac{5 \pi}...
Channel:
Subscribers:
451,000
Published on ● Video Link: https://www.youtube.com/watch?v=wtPPChRUYNc
0Prove that:
\[
\sin \frac{13 \pi}{3} \sin \frac{8 \pi}{3}+\cos \frac{2 \pi}{3} \sin \frac{5 \pi}{6}=\frac{1}{2}
\]
ЁЯУ▓PW App Link - https://bit.ly/YTAI_PWAP
ЁЯМРPW Website - https://www.pw.live