7000*(1+12%)^0.5-7000=
    cos135
    cos45
    cos45
    73260.07+83859.97+92153.82+126584.91+128800.28-250000
    792-489
    1-2/5
    1-1/5
    90-arctan0.63-arctan3.15
    arctan3.15
    arctan0.63
    90-arctan0.62-arctan0.62×5
    8/（1+0.05）+100/（1+0.05）^5
    arctan0.7+arctan0.35=
    8/（1+0.05）+100/（1+0.05）^5
    100/(1+7%)+100/(1+7%)^2+100/(1+7%)^3+100/(1+7%)^4+1000/(1+7%)^4
    35/(1+8%)+35/(1+8%)^2+35/(1+8%)^3+35/(1+8%)^4+35/(1+8%)^5+35/(1+8%)^6+35/(1+8%)^7+1000/(1+8%)^7
    （1000/214.55)^(1/20) -1
    （1000/214.55)^1/20 -1
    6+5

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