sin5π/4cos4π/5tan11π/6sin乘cos乘tan

sin5π/4cos4π/5tan11π/6sin乘cos乘tan
sin5π/4cos4π/5tan11π/6
sin乘cos乘tan

sin5π/4cos4π/5tan11π/6sin乘cos乘tan
前面那个你想写cos5π\4把? 要不求不出来的也!
原式=(-cosπ/4)*(-tanπ/6)*(-sinπ/4)
=(-√2/2)*(-√3/3)*(-√2/2)
=-1/2*√3/3
=-√3/6
祝你成功!

都不知道你写的是sin5兀还是sin5兀／4