Question: 4. [A3] Determine the obtuse angle between the planes x + 231 3x + 6 = 0 and 2x + 4y + 6x 20 =
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4. [A3] Determine the obtuse angle between the planes x + 231 3x + 6 = 0 and 2x + 4y + 6x 20 = 0 to the nearest degree
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