Question: Let P 1 and P 2 be planes with normal vectors n 1 and n 2 . Assume that the planes are not parallel, and

Let P₁and P₂be planes with normal vectors n₁ and n₂. Assume that the planes are not parallel, and let L be their intersection (a line). Show that n₁ × n₂ is a direction vector for L.

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