1)
sin4π/3×cos25π/6×tan5π/4
=0/3*(-1)/6*0/4
=0
2)
sin4π/3×cos25π/6×tan5π/4
=(sin4π/3)×cos(25π/6)×tan(5π/4)
=(-√3/2)(√3/2)(1)
= - 3/4