Question

4 sin pi/12 cos pi/12

Answer 1

$4Sin\frac{\pi }{12} Cos\frac{\pi }{12}=2*(2Sin\frac{\pi }{12} Cos\frac{\pi }{12})=2*Sin(2*\frac{\pi }{12})=2Sin\frac{\pi }{6}=2*\frac{1}{2}=1$

Answer 2

$4 \sin( \frac{\pi}{12} ) \cos( \frac{\pi}{12} ) = 2 \sin( \frac{\pi}{6} ) = 2 \times \frac{1}{2} = 1$