sin〔-25/6π〕的计算过程

问题描述:

sin〔-25/6π〕的计算过程

原式=-sin(25π/6)
=-sin(4π+π/6)
=-sin(π/6)
=-1/2
(周期为2π)

原式=sin(-2×2π-π/6)
=sin(-π/6)
=-sin(π/6)
=-1/2