sin(-4π／3)cos(-23π/6)tan(25π/4)=
sin(-4派/3+2派）cos(-23派/6+4派）tan(25派/4-6派）=
sin(2派/3）cos(派/4）tan(派/4）=
（（根号3）/2）*（（根号2）/2）*1=
（根号6）/4