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Show that the planes and are parallel and find the angle between them.
[4]If the angle between the planes and is , find .
[4]Compute for the acute angle between the planes and .
[7]Find the angle between the plane and the plane perpendicular to the vector .
[4]so that the angle between the planes and is .
[7]Find the angle between the planes and .
[4]the obtuse angle between the planes and .
[5]the angle between the plane through , , and the plane .
[6]Find all real such that the angle between the planes and is .
[7]the acute angle between the planes and .
[6]the acute angle between the planes and .
[5]the acute angle between the planes and .
[5]