(Solved): The angle between two planes is the smallest angle between the normal vectors of the planes, wh ...

The angle between two planes is the smallest angle $$?$$ between the normal vectors of the planes, where the directions of the normal vectors are chosen so that $$0???\frac{?}{2}$$. Find the angle between the planes $$3x+4y?2z=0$$ and $$?4x+2y+4z=0$$. The angle between the planes is (Do not round until the final answer. Then round to the nearest degree as needed.)