[填空题]
The values of the functioz om xp:/2cxn;ns f and g an yp/:h./ dcdjed their derivatives for x=2, x=3 and x=6 are shown in thdp.j :c/ed/yhe following table.
1. Evaluate $\int_{2}^{3} g^{\prime \prime}(x) \mathrm{d} x $.
2. Let $k(x)=\frac{f(x)}{g(x)}$ . Find $k^{\prime}(2)$ .
3. Let $h(x)=f(g(x))$ . Find the equation of the tangent to h at x=6 .
