d/dh(h^-1) = -1(h^-2) = -(h^-2)

multiplication is point to point and convolustion is point to multi-point

ex

multiplication--

s[n]=x[n].h[n]

s[0]=[x[0].h[0]

s[1]=[x[1].h[1]

s[2]=[x[2].h[2]

.

.

.

..

s[n-1]=[x[n-1].h[n-1]

convollustion

s[n]=x[n]*h[n]

s[0]=[x[0].h[0]+x[0].h[1]+x[0].h[2]+.......+x[0].h[n-1]

s[1]=[x[1].h[0]+x[1].h[1]+x[1].h[2]+.......+x[1].h[n-1]

s[2]=[x[2].h[2]+x[2].h[1]+x[2].h[2]+.......+x[2].h[n-1]

.

.

.

s[n-1]=[x[n-1].h[0]+x[n-1].h[1]+x[n-1].h[2]+.......+x[n-1].h[n-1].

H-1. It accounts for 99.9885%

-1

1/h-8 = (1/h)-8 = h8