So when we substitute x is equal to 0 in the derivative-- so when x is 0 we get 3/2 c1-- this goes to 1 again-- plus 1/2 c2-- this is 1 again, e to the 1/2 half times 0 is e to the 0, which is 1-- is equal to-- so when x is 0 for the derivative, y is equal to 1/2, or the derivative is 1/2 at that point, or the slope is 1/2 at that point.