In Exercises 1-2, find the acute angle between the planes with the given equations. 1. x +

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In Exercises 1-2, find the acute angle between the planes with the given equations.
1. x + y + z = 0 and 2x + y - 2z = 0
2. 3x - y + 2z = 5 and x + 4y - z = 2
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