[填空题]
The following diagram show5a:7;g y1s: -o9gtlftqyrpbr,*zs j ps the /c: ga6hd-z2 qyt1 awwgraph of f ′, the derivative of f.
The points $\mathrm{M}(-\sqrt{2},-60)$ and $\mathrm{N}(\sqrt{2},-60)$ lie on the graph of $f^{\prime}$ . The point $\mathrm{P}(\sqrt{2}, 40)$ lies on the graph of the function f .
1. Write down the gradient of the curve of f at P .
2. Find the equation of the tangent to the curve of f at P .
