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    (3.5-(3.1415926-arccos0.358))/0.18/sqrt(1-0.358*0.358)
    cos(arctan(-3.1415926/ln0.3))
    2*4.47*0.479
    4.47*4.47
    3.1415926/0.8/sqrt(1-0.479*0.479)
    cos(arctan(-3.1415926/ln0.18))
    cos(arctan(-3.14/ln0.18))
    cos(arctan(-π/ln0.18))
    (3.14-arccos0.456)/(0.6*sqrt(1-0.456*0.456))
    arccos0.456
    (-2+(110-120))/(30+120)
    -1*2*arctan1-arctan(0.2*3.717641)-arctan(0.0625*3.717641)
    (224+1/222)/223
    699×719
    20lg400
    [1-1/(1+8.0%)^36.80]/[1-1/(1+8.0%)^50]
    [1-1/(1+8.0%)^37.92]/[1-1/(1+8.0%)^50]
    [1-1/(1+8.0%)^36.8]/[1-1/(1+8.0%)^50]
    [1-1/(1+8.0%)^37.92]/[1-1/(1+8.0%)^50]
    [1-1/(1+8.0%)^37.92]/[1-1/(1+8.0%)^50]

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