π/2-arctan75
    π/2-arctan125
    arctan375-arctan-75
    arctan75-arctan-75
    arctan375-arctan75
    1/sin（1/7.66）
    （1.42-0.02/1.26-0.06）-1
    1.42-0.02/1.26-0.06-1
    200 / 4
    9sin(7*20+17)
    9sin(7*25+17)
    9sin(7*8+17)
    9sin17
    8.2%+9%+8%*9%
    （45.2+4.8）/1.13
    (1+8.2%)*(1+8.2%+0.8%)-1
    (1+8.2%)*(1+8.2%+0.8%)
    0.4（π－arccos0.1）
    3-2 3-3/2
    [(223+454)*(1+0.18+0.466+0.2+0.24+0.32)+311]*(445.1%*5+70%*12.5)*(0.2+0.8*2.5)*（1+0.583+0.69）*0.8*0.5

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