tan(π+α)cos(2π+α)sin(α-3π/2) / cos(-α-3π)sin(π-α)=___.}
问题描述:
tan(π+α)cos(2π+α)sin(α-3π/2) / cos(-α-3π)sin(π-α)=___.}
答
tan(π+α)cos(2π+α)sin(α-3π/2) / cos(-α-3π)sin(π-α) =tanα cosα cos α/(-cosα)sinα =-1