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)=___.}

tan(π+α)cos(2π+α)sin(α-3π/2) / cos(-α-3π)sin(π-α) =tanα cosα cos α/(-cosα)sinα =-1