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7. Find the acute angle, correct to the nearest degree, between the pairs of planes defined below. a. x - 2y + 6z - 13

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7. Find the acute angle, correct to the nearest degree, between the pairs of planes defined below. a. x - 2y + 6z - 13 = 0 and 2x + y - z = 5 b. 5x - 4y + 2z - 15 = 0 and 2x - 2y - z = 5 c 2x + 3 y - z z - 10 = 0 and 2x - y + z -6 =0 d. 3x + 2y - 6 = 0 and 4x + 2y + 3z - 18 = 0

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