Question

$\sin 7\pi \div 6$

Answer 1

sin7π/6=sin(π+π/6)=sinπ/6=1/2

Answer 2

$sin( \frac{7 \pi }{6} )=sin( \frac{6 \pi }{6}+ \frac{ \pi}{6})=sin( \pi + \frac{ \pi }{6} )-=-sin( \frac{ \pi}{6} )=- \frac{1}{2}$