[填空题]
Let $f(x)=\sqrt{ } 2 x+1$ for $ x \geq-0.5 $.
1. Find
1. f(12)= ;
2. $f^{\prime}(12)=\frac{a}{b} $;a= ,b= .
Consider another function g(x) . Let $\mathrm{P}$ be a point on the graph g . The x -coordinate of $\mathrm{P}$ is 12 . The equation of the tangent to the graph at $\mathrm{P}$ is y=x+3 .
2. Write down $g^{\prime}(12) $= .
3. Find g(12)= .
4. Let $ h(x)=f(x) \times g(x)$ . Find the equation of the tangent of h at the point where x=12 .
