sin4/3π×cos5/6π×tan(－4/3π）
=sin(π+ π/3)×cos(π- π/6)×[-tan(π/3 +π)]
=-sin(π/3)×[-cos(π/6)]×[-tan(π/3)]
=-(根号3)/2 × (根号3)/2 × 根号3
=-3(根号3)/4