Question 621605
factor & simplify: 
csc^3x-csc^2x-cscx+1
=csc^2x(cscx-1)-(cscx-1)
=(cscx-1)(csc^2x-1)
=(cscx-1)(csc^2x-1)
=(cscx-1)(cscx+1)(cscx-1)
=(cscx+1)(cscx-1)^2