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    5/7=
    tanarccos0.67-tanarccos0.92
    26973588408.60/34059175850.30
    2391641182.47/34059175850.30
    arcsin0.08923
    1000*0.9^30
    100*(0.9^30)
    100*(0.5^30)
    100*0.5^30
    30×50×(1+6%)×(1+4.5%)×(1+7%)×(1+3.41%)+12×480×(1+7%)×(1+3.41%)+(40×2×30+2×900×60%)×(1+7%)×(1+3.41%)(12×3×30+3×600)×(1+7%)×(1+3.41%)+(50×30+10×700)×(1+7%)×(1+3.41%)=
    arccos0.06
    arccos-0.06
    [1387×(1+0.0518)×1.0869×1.3612+0]×0.9884
    [1-1/(1+6.50%)^59.49]/[1-1/(1+6.50%)^70]
    arccos0.94
    1.02^4.21
    arccos(-0.344)
    1.02^4.22
    10∧1/3
    1000/(1+0.035)^50

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