The acute angle between the planes P_1 and P_2, when P_1 and P_2 are the planes passing through the intersection of the planes 5 x+8 y+13 z-29=0 and…

The acute angle between the planes $\displaystyle P_1$ and $\displaystyle P_2$, when $\displaystyle P_1$ and $\displaystyle P_2$ are the planes passing through the intersection of the planes $\displaystyle 5 x+8 y+13 z-29=0$ and $\displaystyle 8 x-7 y+z-20=0$ and the points ($\displaystyle 2$, $\displaystyle 1$, $\displaystyle 3$) and ($\displaystyle 0$, $\displaystyle 1$, $\displaystyle 2$), respectively, is