arccos(330/270)
    (25×(tan29.737－tan20.706)+85×(tan23.848－tan20.706)）/2π
    arccos((85×cos20.706）/(85+2×cos15)
    arccos((85×cos20.706）/(85+2×cos15）)
    arccos((85×cos20.706)/(85×2×cos15)）
    arccos((25×cos20.706)/(25+2×1×cos15)）
    arccos(26×cos20.706)/(26+2×1×cos15)
    arctan(tan20)/(cos15)
    384.6×1.2÷4
    384.6×1.2÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4
    384.6×1.0÷4

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