来自霍伟的问题
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)的值为______.
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)的值为______.


设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)的值为______.
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)的值为______.
sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)