Mathematics
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    arccos0.913590048
    sqrt(2+sqrt(3))+sqrt(2-sqrt(3))
    √8721
    arccos(-0.958)
    arccos0.8
    160×5000+160×3500-190000
    (50×70×0.9×0.9×12)÷0.05-118000
    479.06×[1-1/(1+8.0%)^58.40]
    (139.00+200+23.02+33.90+39.59)×(1+10%)
    3405.98-3014.1415929203
    3405-3014.1415929203
    1883.92/(1+93.2%)
    522.28×[1-1/(1+8.0%)^58.40]
    (139.00+200+23.02+50.85+61.93)×(1+10%)
    cos(25π-2)
    ln10
    (27/128)/(50/51)
    7/9*0.375
    7/9*0.375+0.375
    1+7/9*0.375

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