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For the vector vec(B) = (:7, 12, 21:) calculate a, the angle between the vector and the x-axis. Calculate the angle between the vector

For the vector vec(B) = (:7, 12, 21:) calculate a, the angle between the vector and the x-axis. Calculate the angle between the vector B = (7, 12, 21) and the positive z-axis.

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