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Find the cosine of the angle between the planes 2x + y - 2z = 5 and 3x - 6y - 2z = 7.
A4/21
B2/7
C1/3
D5/21
Answer & Solution
Correct answer: A. 4/21
The dot product of normals is 6 - 6 + 4 = 4 and the normal lengths are 3 and 7, giving 4/21.
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