The area bounded by the curve $y=x^2+3, y=x, x=3$ and $y$-axis is

$$ \int\limits_{\frac{-\pi}{2}}^{\frac{\pi}{2}}\left(x^2+\log \left(\frac{\pi-x}{\pi+x}\right) \cdot \cos x\right) d x= $$

$$ \int_0^1 \log \left(\frac{1}{x}-1\right) d x= $$

If the foot of the perpendicular drawn from the origin to a plane is $\mathrm{P}(2,-1,4)$, then the equation of the plane is