The acute angle between the planes $\mathrm{P}_1$ and $\mathrm{P}_2$, when $\mathrm{P}_1$ and $\mathrm{P}_2$ are the planes passing through the intersection of the planes $5 x+8 y+13 z-29=0$ and $8 x-7 y+z-20=0$ and the points $(2,1,3)$ and $(0,1,2)$, respectively, is
