x^4-5x^3＋4x^2＋4＝0
    P=12.41-0.0246P
    X+1=2
    2.53/Y=Y-6.8
    （41.183+x）×1.55＝41.783+73.666-x
    （41.183+x）×1.75＝41.783+73.666-x
    （41.183+x）×1.95＝41.783+73.666-x
    （41.183+x）×1.95＝41.783+74.666-x
    （41.183+x）×1.75＝41.783+74.666-x
    （41.183+x）×1.55＝41.783+74.666-x
    x*x*x+10*x*x+25*x+15=0
    0.8=x/0.05+x
    x*3.99=2.4
    x*3.99=2.68
    arccot45
    cot^1(45)
    x*0.1-210=6070
    11000cos(x)+3280sin(x)=10500
    10852cos(x)+3280sin(x)=10500
    12600cos(x)+3450sin(x)=10500

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