Traditional Culture Encyclopedia - Traditional festivals - On the problem of finding angle in spatial rectangular coordinate system
On the problem of finding angle in spatial rectangular coordinate system
As shown in the figure, θ is what we want, θ and ψ are complementary, that is, sinθ=cosψ. Because we use vector solution, the pinch range of vector and vector is 0- 180 degrees, and the pinch range of line is 0-90 degrees, so cosψ takes justice, so we add absolute value.
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