2arctan(√3/3(sin(arctan(√3/2))))
    π/2-arcsin0.75
    2arctan(√3×0.7137/3)
    arctan(√3×0.7137/3)
    √3×0.7137/3
    arctan(√3/2)
    π/2-arcsin0.75
    π/2-arcsin3/4
    2arctan(1/√3sin(arctan√3/2))
    2arctan(√3/3sin(arctan√3/2))
    π/2-arcsin0.75
    2arctan√6/6
    arctan√6/6
    √101÷1.97
    ［1-1/（1+8.0%）^35.1］/［1-1/（1+8.0%）^50］
    ［1-1/（1+8.0%）^35.22］/［1-1/（1+8.0%）^50］
    91.158*50*0.02%
    0.6*(2^1.3+2^1.9+2^2.5+2^3.1+2^3.7)
    1*sin（45）/1.5
    cos(-38.4)

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