arctan0.117
    arctan0.129
    arctan0.137
    arctan(4/(170-141))
    90*1/（1+50％）7
    π/8
    2arcsin(π/8)
    2arcsin(√2/4)
    2arcsin(√4/2)
    -7/9log2(7/9)-2/9log2(2/9)
    -log2(7/9)-2/9log2(2/9)
    25*25+3
    25*25+3
    arctan0.6
    1440.61×［1-1/（1+8.0%）^58.27］
    sin31.56
    34/60
    sin21
    arctan0.316
    ㏒107

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