Nilai dari sin (π/3+x) cos (π/6-x) + cos (π/3+x) sin (π/6-x)

jawab
sin (π/3  +x)  cos (π/6 - x)  + cos (π/3 + x) sin (π/6 - x) =
= sin { (π/3 + x + π/6- x) }
= sin (π/2 )
= 1