Mathematics
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    tanarccos0.88
    18.62*21*(8.5-21*0.22*tan27)
    tan90-1/sin90
    (515/2)^2-(485/2)^2
    (515/2)^2+(485/2)^2
    24÷7.2
    ln10
    ln100
    ln(101-1)/101
    ln(2-1)/2
    ln(2-1)
    π+1
    e^0.5
    2000/1.8
    0.06^1.7
    log(1.5,2)
    3000×15%×(50÷100)
    3000×20%×(50÷100)
    3000×60%×(10÷12)
    2000×60%×(10÷15)

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