Difference Operation% d1(n)=x(n)-x(n-1)  1st  Order Difference of x(n);% d2(n)=d1(n)-d1(n-1)  2nd  Order Difference of x(n);% d3(n)=d2(n)-d2(n-1)  3RD  Order Difference of x(n);%……Code a function for y(n）=dk(n);% e1(n)=y(n)-y(n-1)  1st  Order Difference of y(n);% e2(n)=e1(n)-e1(n-1)  2nd  Order Difference of y(n);% e3(n)=e2(n)-e2(n-1)  3rd  Order Difference of y(n);Code an other function for y(n）,where ek(n)=C;Show y(n) for x(n)=sin(pi*n/3);What if y(n)=dk(n)&ek(n)=C?应该用迭代是吧，怎么开始写呢？初学者，能力有些弱。。。