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The angle between the two vectors,

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The angle (¥è) formed by two vectors U = (Ux, Uy, Uz) and V = (Vx, Vy, Vz) can be obtained as follows.

cos(¥è) = U¡¤V / |U||V| = (Ux*Vx+Uy*Vy+Uz*Vz) / ((Ux^2+Uy^2+Uz^2)*(Vx^2+Vy^2+Vz^2))^(1/2)

¥è = arccos((Ux*Vx+Uy*Vy+Uz*Vz) / ((Ux^2+Uy^2+Uz^2)*(Vx^2+Vy^2+Vz^2))^(1/2))

*** Âü°í¹®Çå[References] ***

¥è = arccos(1 / ((Ux^2+Uy^2+Uz^2)*(Vx^2+Vy^2+Vz^2))^(1/2) * (Ux*Vx+Uy*Vy+Uz*Vz))
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