Mathematics
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    tan12^2
    180*50/3.1415926/5.208
    180*50/3.1415926/3.958
    180*50/3.1415926/3.886
    180*50/2.963/3.1415926
    3(1*1)
    12加12除6
    12加12除6
    tanarccos0.91
    [1748×(1+0.0586)×1.0969×1+0]×0.9963
    [1-1/(1+8.0%)^62.30]/[1-1/(1+8.0%)^70]
    [1748×(1+0.0586)×1.0969×1+0]×0.8883
    [1-1/(1+8.0%)62.30]/[1-1/(1+8.0%)70]
    e3
    e
    -10lg(1-0.3974)=
    -10log(1.2)
    -10log(0.3974)
    -10log(1-0.3974)=
    -10log(2.235)=

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