单词	direction cosines
释义	direction cosines In 3‐dimensional space, a direction can be specified as follows. Take a point P such that has the given direction and |OP| = 1. Let α, β and γ be the three angles ∠xOP, ∠yOP and ∠zOP, measured in radians with 0 ≤ α, β, γ ≤ π. Then cosα, cosβ, and cosγ are the direction cosines of . Point P has coordinates (cosα, cosβ, cosγ), and so cos2α + cos2β + cos2γ = 1. direction angles
随便看	ordered pair order isomorphism order notation order of contact order of convergence order of magnitude order statistics ordinal data ordinal number ordinal scale ordinary differential equation ordinate orientable orientation origin orthocentre orthogonal orthogonal complement orthogonal curves orthogonal matrix orthogonal polynomials orthogonal projection orthogonal set orthonormal Osborne's rule

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