arctan0.5
    arctan5
    arctan2.5
    -x^2+4x-3=0
    93.24*e[0.00673*(100-93.24)]
    93.58*e[0.00673*(100-93.58)]
    90.9*e[0.00673*(100-90.9)]
    95.4*e[0.00673*(100-95.4)]
    94.97*e[0.00673*(100-94.97)]
    94.88*e[0.00673*(100-94.88)]
    94.01*e[0.00673*(100-94.01)]
    25400/(14.7+254)
    25400/(13.69+254)
    25400/(19.94+254)
    600/x-20-600/x=1.5
    600/x+1.5=600/x-20
    818861.93/10944668477.76
    818,861.93/10,944,668,477.76
    (0.5222 *Z^-1+0.7737*Z^-2-0.8414*Z^-3)(Z+0.2*Z^-1)
    54.785=1.65026+17.05872a-1.45701a^2

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