Find the cosine of the angle between the planes x + y + z = 0 and x + 4y + 3z = 2.

Find the cosine of the angle between the planes x + y + z = 0 and x + 4y + 3z = 2.

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Find the cosine of the angle between the planes x + y + z = 0 and x + 4 y + 3 z = 2 .

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