令α=arctan(cotθ/2)
cot(π/2-α)=tan(arctan(cotθ/2)=cotθ/2
π/2-α=θ/2
α=π/2-θ/2
即：arctan(cotθ/2)=π/2-θ/2
关于arctan(cotθ/2)=π/2-θ/2
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