Question

Use a calculator to find the acute angles between the planes in Exercises 53–56 to the nearest hundredth of a radian.

53. 2x + 2y + 2z = 3, 2x - 2y - z = 5

54. x + y + z = 1, z = 0 (the xy-plane)

55. 2x + 2y - z = 3, x + 2y + z = 2

56. 4y + 3z =-12, 3x + 2y + 6z = 6

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