Mathematics
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    -π÷2-arctan(3.936)-arctan(0.01*3.936)
    √(16^2÷10^2÷(10^2+1)÷((0.01^2)*10^2+1))
    √(1600÷80÷(0.04*80+1)÷((0.0625^2)*80+1))
    √(1600÷80÷(0.04*80+1)÷(0.0625^2*80+1))
    1600÷80÷(0.04*80+1)÷(0.0625^2*80+1)
    -90-arctan(0.2*12.137877)-arctan(0.0625*12.137877)
    π÷2-arctan(0.2*12.137877)-arctan(0.0625*12.137877)
    [2046×(1+0.0518)×1.0854×1.3612+0]×0.9971
    [1-1/(1+6.50%)^66.65]/[1-1/(1+6.50%)^70]
    1.02^4.14
    1.02^4.15
    1.02^4.14
    tan55
    sin70/1-cos70
    sin30
    sin70
    1.5^120
     tan45
    tan45
    100%

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