10. Show how to get from this (hints: h(x + k) = h(x) when k = 0). g(x + k)h(x) - g(x)h(x + k) 1 = lim . lim K-+0 k k-+0 h(x)h(x +k) to this: g(r + k)h(x) - g(x)h(x) +g(x)h(x) - g(x)h(x + k) lim k-+0 k h(z)2