Mathematics
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    eC(2,5)
    0.06/12
    8*((1-1.12682503^(-12*4))/0.12682503)/(1.12682503)^2
    1000*((1-1.08^(-20))/0.08)
    850×(850×5)
    cos(0.0001)
    tan(232.219737)
    =arctan(450-150-200)/(4200-1500-350-400)
    arctan(450-150-250)/(4200-2000-450-300)
    arctan(450-200-200)/(4000-1500-350-300)
    (1000/0.4845056207)+(4000/0.4845056207)/(1+0.4845056207)^3
    (1000/0.4845056207)
    (1000/0.4845056207)/(1+0.4845056207)^1+(4000/0.4845056207)/(1+0.4845056207)^3
    (1000/0.4845056207)+(4000/0.4845056207)/(1+0.4845056207)^2
    (1000/0.4845056207)/(1+0.4845056207)^2+(4000/0.4845056207)/(1+0.4845056207)^4
    2925000*(((1.032478^180)-1)/0.032478)
    15*12
    3500000-575000
    12/tan64.59
    (78000*(((1.05^26)-1)/0.05))/25

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