Question: (a) Show that the planes x + y - z = 1 and 2x - 3y + 4z = 5 are neither parallel nor perpendicular.

(a) Show that the planes x + y - z = 1 and 2x - 3y + 4z = 5 are neither parallel nor perpendicular.
(b) Find, correct to the nearest degree, the angle between these planes.

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